Been doing some research on oils and I think I'm gonna run Shell Rotella in our 90T. I've only done 1 oil change to it since we bought it and i used 10w-30 mobil 1. Wondering if any others out there are using 15w-40 diesel oil in their cars? I looked at the back of some mobil 1 "extended pefromance" oil and it meets SL/CF API standards. Now Shell and Delo meet SL/CI-4+.. which is much higher than CF. I've always been a synthetics user, but i can't justify $5.xx/qt for oil that meets lower API specs. Gotta wonder what kind of crack you're on if trucks worth a ton of money use shell and you're paying more for something that meets lower standards. And it's only $8/gal! lot better price than Mobil 1. I live in FL, so the cold pouring doesn't matter to me. Sometimes you just have to wonder about the "synthetics". in all practical purposes.... is it gonna make a difference! Probly not unless you live in Canada or Alaska. and the wear/efficiency gain probly only pays for itself/shows itself over a LONG time and distance, like a Fleet or something.
Using Shell Rotella T 15W-40 oil
- Thread starter Supra5MGTE
- Start date
i always liked 15w40, gave me nice oil pressure. the reason i dont really run it is because my turbo burns oil and every so often i have to dump a quart in there, and you just dont find 15w40 at many places. id rather stick with the same grade.
Y'know, I've always been tempted to try it in my Supra, but always wondered if the different formulation will throw things off.
15w40 weight oil is hard to find around where I am, so I generally run 10w40. But I think my oil pump is original, so I wonder if 15w40 would give better oil pressure/help with looseer tolerances on my 157k engine. BUT I worry that a sudden chemical change in the oil could wreak havoc on something vital...
There's actually a Rotella forum where I found this thread which talks about Rotella T in a gas engine--long story short, it meets engine lubrication specs for most gasoline vehicles, but is not catalytic converter-safe.
15w40 weight oil is hard to find around where I am, so I generally run 10w40. But I think my oil pump is original, so I wonder if 15w40 would give better oil pressure/help with looseer tolerances on my 157k engine. BUT I worry that a sudden chemical change in the oil could wreak havoc on something vital...
There's actually a Rotella forum where I found this thread which talks about Rotella T in a gas engine--long story short, it meets engine lubrication specs for most gasoline vehicles, but is not catalytic converter-safe.
i run 15-40 all year long. im also driving like a manic too! never any problems! i just let it warm up for a couple minutes in the mornings when its cold. i too am going to start using rotella. its easy to find here and a lot cheaper on the wallet.
Ok, that's what I thought. for me 15-40 rotella is everywhere and about $8/gallon. we sell it at work so it'd only run me $1.60/qt!! way cheaper than $4-6/qt mobil 1. I've been researching oil lately and come to find out the new "SM" API rating is crap. Why? b/c the EPA or someone is tightening up restrictions on oil for gas engines and the additives (quality and lubricity) are suffering. that's why you find.... SM/CF oil... and SL/CI-4+ oil. you won't find SM/CI-4+ b/c they conflict with each other. the EPA or whatever hasn't touched the Diesel "commerical" oil... so I'm going with it. SL is way higher than what our engines require.... so it should do fine. and the extra Chems will just keep the inside of our gas motors very clean and UN-SLUDGED. I think the additive that's suffering is Zinc and phosphurus. not to mention Diesel oil has some serious Anti-foaming properties.
I'm definitely trying it next time I do a change. I read some more on Rotella forum and there were some guys on there claiming that they've been running Rotella T in their gas engines for decades with no problems. No clogged/fouled cats either, so I'm convinced enough to give it a try...
The Oil I use comes from a company that specialises in Long Haul Truck oil and as so many people were using it in their gas engines they released a blend for us!
Then they stepped it up to a full synthetic which is what I'm running now.
No matter what the price Oil will always be the cheaper component compared to losing a motor.
Then they stepped it up to a full synthetic which is what I'm running now.
No matter what the price Oil will always be the cheaper component compared to losing a motor.
Heres some Awesome info on Oil. I myself use Castrol 40wt in my 89 N/A year round here in Socal. and Chevron Delo 40wt in my dodge V8 van. One thing I would do is Look Very Carefully at the Supra Owners manual at the chart that shows you what Viscosity to use in what Tempratures. I have also heard Shell Rotella is an Equal to Chevron Delo in the trucking industry. I believe both are used in Aircraft also.
Rick
http://www.bobistheoilguy.com/
Rick
http://www.bobistheoilguy.com/
Rotella is an oil that can be used in diesel engines. I'm pretty sure it can be used in gasoline engines. Oils formulate to meet diesel standards, such as Chevron Delos 400, usually meet gasoline engine standards too. I'm using Amsoil diesel synthetic motor oil in my 4Runner, since it doesn't work in my Ford diesel.
some of us ( me being aoca certified, look it up) know a few things. using desil oil in your gas engine will NOT harm your engine. ive been running 15-40 for more that a year and the guy i bought it from was running the same weight.(we both change our oil in the supra at 2k miles). and yes i may need a dictionary, but i dont need a dictionary to know how a internal combustion engine works. 8 th of 9 kids and 7 of us are mechanics. the other two are my sisters so that should explain that.
"Lastly, anyone running 15-40 or similar in a healthy engine needs to learn something about oil. "
jetjock- are you saying that 15-40 is a bit thick for a "healty" engine? I live in Florida, in the summer its so hot it's not funny. temps over 100 easily. I think running the 15-40 oil in my '94 4runner with 140K miles that gets driven hard is no biggie, or in our 94K mile 90T supra. you're going from a 10 to 15, and from 30 to 40. it's not like you're pouring in 20-50 in a motor that's brand new and calls for 5-20. Down here in the sweltering heat most people run 20-50. Even the Honda guys!!! they'll come into my work buying VR1 valvoline 20-50 oil for the summer. and 10-40 for winter. (sounds like they should just run 15W-50 Mobil 1!)
jetjock- are you saying that 15-40 is a bit thick for a "healty" engine? I live in Florida, in the summer its so hot it's not funny. temps over 100 easily. I think running the 15-40 oil in my '94 4runner with 140K miles that gets driven hard is no biggie, or in our 94K mile 90T supra. you're going from a 10 to 15, and from 30 to 40. it's not like you're pouring in 20-50 in a motor that's brand new and calls for 5-20. Down here in the sweltering heat most people run 20-50. Even the Honda guys!!! they'll come into my work buying VR1 valvoline 20-50 oil for the summer. and 10-40 for winter. (sounds like they should just run 15W-50 Mobil 1!)
Your gauge went up becuase the more viscous oil did not flow as well. Pressure is resistance to flow.
ok does this guy actually know what hes talking about? Should i really throw out all information that has been forced into my head about "dont run 10w-30, its way too thin for our engines". He's definatly selling it to me so maybe i should start running a 0w oil... i donno though. One thing that is keeping me from going to 0w is the fact that the owners manual says 10w-30 is the lowest you should go. So whats the truth?
Well. I don't care. I'm running Castrol Synthetic 15W-40 Diesel Oil. Been running it for a while and it works just fine...Actually, I believe I'm due for an oil change rightabout now! 
So i read that were sposta use 15w40 or 15w50. I couldnt find synthetic 15w40 at autozone so i grabbed some mobile 1 extended performance 15w50 and i must say it works very well. Engine seems to run smoother and i have much better oil pressure. I also used a mobile 1 high efficiency oil filter... not a cheap oil change but id say it was worth it.
I have about one-hundred fifty thousand little things sitting right in the middle of my speedo that are keeping me from trying any low weight synthetic oil right now...
Until I rebuild I'll keep on keepin' on with the dino oils and the 3k oil change intervals...but Bobistheoilguy.com is a great read, and has actually got me curious to start experimenting with different oils once I have the time and money.
I think jetjock makes many good arguments, especially in regards to oil viscosity vs. ambient temps. I really don't know enough about oils though at this time to make any solid arguments...I'm not quite the expert tribologist yet.
Until I rebuild I'll keep on keepin' on with the dino oils and the 3k oil change intervals...but Bobistheoilguy.com is a great read, and has actually got me curious to start experimenting with different oils once I have the time and money.
I think jetjock makes many good arguments, especially in regards to oil viscosity vs. ambient temps. I really don't know enough about oils though at this time to make any solid arguments...I'm not quite the expert tribologist yet.
