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Re: Is 5w-40 oil alright to use?
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The 0W-40 is a lot thinner when cold and flows into the tight clearances between the bearings, rings and oil passages of a newly rebuilt or newer engine. After breaking in my new engine with conventional oil (5 changes in 1000 miles) I started the 0W-40.
The Mobil 1 0W40. It is closer to a 10W30 than a 10W40 at operating temperatures. It has an excellent HTHS viscosity, so it shouldn't shear even in an STi engine under stress. It also has great low temperature viscosity for cold climates.
One other thing to note is that the Mobil 1 0W40 has a very high TBN value, which means it is great for extended oil change intervals.in my case every three years with only a filter change and new oil annually.
If you want some extra seal conditioners to hold off leaks on notoriously leaky Subaru engines, either blend the M1 0W40 with the M1 5W30 HM or add Lubegard Bio/Tech Engine Protectant to the M1 0W40 oil. I was not looking for the seal conditioners of a high mileage oil , which you may need.
The Lubegard product adds some seal conditioners and a special polar ester molecule that creates an additional protective coating on engine parts.
The added ester film on the metal surface will help avoid damage when you start the car after it has sat for a long time.
The recommendations were from Blackstone Labs, which does my used oil analysis. Along with consultations with Mobil 1 directly.
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Subaru Ambassador
1996 Polo Green LSi #216 ..138,100 miles. ..SOLD
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Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan
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