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  #21  
Old September 23rd, 2010, 11:32 AM
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Brian
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I've got a case of Mobil 1 0W-40 that I was going to use in my 90. Does anyone think that weight is too thin for Southern California temps (60s and up year round) or am I totally off track?

Truck has about 43K miles and surprisingly no leaks...
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  #22  
Old September 23rd, 2010, 11:56 AM
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I pulled a motor apart about 4-years ago from a 1995 D1. The engine had 240,000 miles, and since about 70k the owner used only Rotella-T. That engine, too, was spotless. I've actually still got it. This is the reason I only use Rotella-T in the engine.

A clean engine has nothing to do with synthetic oil.
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  #23  
Old September 23rd, 2010, 03:19 PM
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ok, in goes the Mobil one synthetic. now just need to get some Redline MTL to shift like "Butta"
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  #24  
Old September 23rd, 2010, 03:39 PM
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I've heard and understand it's never too late to switch to synthetic. it basically arrests wear completely. I have also heard you should not mix dino and synthetic as metioned. the only time using one or the other DOES matter is breaking in an engine. Never use synthetic on a new engine block. the piston seals must wear to set correctly. add synthetic from the start and that will not happen. I use dino oil for first 1500 miles, then switch to synthetic for life of engine.

I use mobile 1 exclusively in my 2.8 and my wife's DII. Mobile 1 turbo diesel for me. in hers, we were using regular 10W40, but she has been having some age leaks down by the main seals. switched her to Mobile 1 high mileage, and that had a significant positive effect on those leaks.
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  #25  
Old September 23rd, 2010, 03:47 PM
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Quote:
Originally Posted by specops1526 View Post
I've got a case of Mobil 1 0W-40 that I was going to use in my 90. Does anyone think that weight is too thin for Southern California temps (60s and up year round) or am I totally off track?

Truck has about 43K miles and surprisingly no leaks...
0w 40 is the best mobil one IMHO
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  #26  
Old September 23rd, 2010, 03:51 PM
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Quote:
Originally Posted by evilfij View Post
0w 40 is the best mobil one IMHO
I know the shear ratings, etc. are the best for these engines but you don't think it's too light/thin for warmer temps?
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  #27  
Old September 23rd, 2010, 04:19 PM
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No because when it gets warm it is a 40w.

0w is the cold weight.
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  #28  
Old September 23rd, 2010, 05:44 PM
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Quote:
Originally Posted by evilfij View Post
No because when it gets warm it is a 40w.

0w is the cold weight.
good to know. guess I'll go ahead and use it.
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  #29  
Old September 23rd, 2010, 06:21 PM
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Just FYI there are no moving parts inside an engine that actually touch. When in operation, it's all kept separate by a thin hydrodynamic layer of oil. The benefit of synth is it's ability to maintain viscosity over a wider temp range than conventional oil.
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  #30  
Old September 23rd, 2010, 08:16 PM
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Quote:
Originally Posted by evilfij View Post
0w 40 is the best mobil one IMHO
10w40 High Mileage has a higher sheer rating 2nd to the 50wt diesel oil in the Mobil line
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  #31  
Old September 24th, 2010, 11:57 AM
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Brian Love
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Quote:
Originally Posted by Overlander View Post
I've heard and understand it's never too late to switch to synthetic. it basically arrests wear completely. I have also heard you should not mix dino and synthetic as metioned. the only time using one or the other DOES matter is breaking in an engine. Never use synthetic on a new engine block. the piston seals must wear to set correctly. add synthetic from the start and that will not happen. I use dino oil for first 1500 miles, then switch to synthetic for life of engine.
You switched that early? I was giving my 10K to get nice and broken in. The mixing and matching of oils, as I understood, is not supposed to be detrimental, you just don't get the full benefit of the 'good stuff'. That said, with all the additives in them now a days, I wouldn't probably want to mix and match either. I do know that when I switched to Syn in the 3.9L engine, the leaks started within about 2 months (that means the syn was doing it's job). I should have prob timed the switch to a seals refresh, but it got me the excuse for a 2.8L . My next vacation is going to involve some serious Rover maintenance (just too hot this sumer) and the Syn oil change will be due then.
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  #32  
Old September 24th, 2010, 12:00 PM
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Lotus says switch to synthetic at 1000-1500miles from new.
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