Mobil 1 engine oil

[muleski]

I realize that this has been covered a gazillion times. I've been doing some searching for few hours, including sites like BITOG, and Mobil. I'm going around in circles.

My 2000 LC has 185K miles on the clock. About to do my second 90K service, including all of the fluids. I've been using Mobil One 5w30 from about 20K on, with no issues. I want to keep this truck for another 100K, and have been wondering if there's a better choice. I'm in New England. Mobil works for me, as it's readily available.

Any thoughts on 0W40, or the Turbo Diesel/Truck 5W40? Does Mobil no longer sell a Delvac labeled product? Wasn't Delvac 5W40 a popular choice?

Any input is really appreciated. Thanks!

 

[KLF]

I personally don't see any reason to change, brands or grade. I used to use Mobil 1 for everything, but now I can get Amsoil a little cheaper, and it shows up on my doorstep, no sneaking into WalMart to buy it.

 

[Michael Hanson]

I have had a few cruisers and We have a few we drive now. We use Mobil One 10-w30 in all cruisers,in our Mercruisers. No problems. Mike

 

[1loudLX]

I use normal M1 5w-30, have been for years.

 

[FLYINGLOW]

Ya, I've had good luck with Mobil 1 for 20000m now. I was worried about the seals leaking cause I've heard horror stories about seals leaking after switching to synthetic. Toyota actually recommends it and sells it at the dealerships.

 

[1loudLX]

I've been running M1 syn for probably close to 100k miles

 

[hks3sgte]

My 100 has always had 0W40 Mobil 1. Best oil I have ever used.

 

[1loudLX]

I guess if I started running 0-40 I could buy a pallet for the LX and 911.

 

[muleski]

Thanks. I'm going to stick with Mobil 1, the question is whether to stick with 5W30, or make a change. Appreciate the input re the 0W40. Any thoughts on the 5W40 turbo diesel/truck oil?

 

[SWUtah]

What is your change interval? If you change oil every 5K miles you can use almost any oil in the LC 4.7 V8 and it will have almost zero wear. Go to Welcome members have done oil change analysis on our engines and claim it shows almost no wear using mobil 1 5w30 for over 10K mile oil/filter changes and feel it is one of the easiest engines made on oil.

 

[hks3sgte]

I guess if I started running 0-40 I could buy a pallet for the LX and 911.

win-win, no?

 

[cary]

Take a cruise over the 80 forum, I and Raventail have written a lot about the 0w-40 and 5w-40 Turbo Diesel and Truck (repackaged Delvac). For the 100 series, I would use the 0w-40.

 

[scottm]

I've run Mobil1 15W-50 in many cars for decades. It seemed to flow much better than lighter dino-oils in sub-zero starts, and didn't thin in my turbo cars in the summers in Texas. I've run many cars over 200k on it without any oil-related issues. Both my '97 Landcruisers leaked so much I epoxied my garage floor, but switching to Shell Rotella T Synthetic 5W-40 stopped the leaking. I just put a fresh 7.2 quarts of Shell in my 100, couldn't find the Delvac cary recommends. Availability is somewhat important. I'd like to find the Delvac locally, if it's reasonably priced I might try it.

 

[NMuzj100]

Why would you run 0w-40 when the engine was designed for 5w-30. There is no advantage to the heavier weights with modern oils and a modern engine.

I run Mobil 1 0w-30 or 5w-30 depending on availability.

 

[scottm]

Why would you run 0w-40 when the engine was designed for 5w-30. There is no advantage to the heavier weights with modern oils and a modern engine.

I run Mobil 1 0w-30 or 5w-30 depending on availability.

I'm skeptical the engine was "designed for" 5W-30. More likely marketing, politics, and PR decided what oil would be designated after the engine was designed. Usually it's the thinnest oil the engine can stand, so it gets better mileage. If the engine proved particularly finicky about it's oil that might give the engineers some say in it, but I don't think this engine is all that picky. Like I said, I ran 15W-50 for decades in small turbos and V-8s, sold or totalled many cars with over 200k and no problems.

 

[hks3sgte]

"designed for" actually has to do with MPG ratings and other silly things like that.

 

[PACNW96]

I run M1 10W-30 in my WRX and 80 series. I ran M1 5W-30 eariler on in my WRX, but had some oil usage so bumped up to 10W-30 and have ran it successfully in both cars ever since. On my 80 the manual states you can run 10W-30 above 0*F.

According to BITOG M1 5W-30 and 10W-30 run a little lower viscosity than what is considered normal. My recent Blackstone oil analysis confirmed this, but they didn't seem concerned.

Personally, I don't go outside what the manual recommends, but that's just me.

 

[hks3sgte]

Manual also recommends tiny tires!

 

[cruiser100]

M1 5W-30 here. Says so on that little thingy on the engine... oil filler cap maybe???

 

[Jim_Chow]

I'm skeptical the engine was "designed for" 5W-30. More likely marketing, politics, and PR decided what oil would be designated after the engine was designed. Usually it's the thinnest oil the engine can stand, so it gets better mileage. If the engine proved particularly finicky about it's oil that might give the engineers some say in it, but I don't think this engine is all that picky. Like I said, I ran 15W-50 for decades in small turbos and V-8s, sold or totalled many cars with over 200k and no problems.

The same 2UZ engine in Japan (and I think Oz) is rated with 10w30 oil. I believe the 5w30 is just to boost the CAFE test results, and any oil weight you use for those tests must be the recommended weight for the vehicle (and weight used at the dealership when servicing). I use M1 Delvac 5w40 (sold at commercial fuel/oil supply shops, larger truck stops; I go to Phoenix fuel in Tucson) in the 100 and M1 0w40 in my other cars. The M1 Delvac is sold in 1 gal or larger containers. The website says they come in 5 gal pails, but my shop only has four 1-gal cases and 55 gal drums (bet that costs $$$$). I also buy the M1 delvac 75w90 gear oil from them in 5 gal pails (cheaper in the pail than by the individual quart, like $6 vs. $8-9/qt)