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Re: 5w-40, Is anyone using it..Mobile One et al
Well....not so fast.
The 3.8L engine used in the SAE and ILSAC engine oil testing is not like the 3.8s in our cars. One major difference is that it's converted to a flat tappet camshaft whereas all the 3800s in 4Gen F-cars have hyd. rollers.
The engine, also, has some other differences such as higher valve spring pressure.
For more information on Seg. IIIg, see this article on engine oils at:
http://www.corvetteactioncenter.com/tech/oil/
As for a 5W40 in a 3.8, I have no personal experience with that in a V6, but in other of my engines, the only one in which I use a 40wt is a modified Big-Block Chevrolet. Unless you have big bearing clearances or lots of piston clearance you don't need a 40 wt. As for the 5W part, if you live where you drive in cold winters, it's a good idea. If you live where it's hot a 5W is ok as long as it's a synthetic.
In any event, you can't go wrong with Mobil 1 5W30 or Gibbs Driven LS30 5W30.
Originally posted by LETZRIDE
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The 3.8L engine used in the SAE and ILSAC engine oil testing is not like the 3.8s in our cars. One major difference is that it's converted to a flat tappet camshaft whereas all the 3800s in 4Gen F-cars have hyd. rollers.
The engine, also, has some other differences such as higher valve spring pressure.
For more information on Seg. IIIg, see this article on engine oils at:
http://www.corvetteactioncenter.com/tech/oil/
As for a 5W40 in a 3.8, I have no personal experience with that in a V6, but in other of my engines, the only one in which I use a 40wt is a modified Big-Block Chevrolet. Unless you have big bearing clearances or lots of piston clearance you don't need a 40 wt. As for the 5W part, if you live where you drive in cold winters, it's a good idea. If you live where it's hot a 5W is ok as long as it's a synthetic.
In any event, you can't go wrong with Mobil 1 5W30 or Gibbs Driven LS30 5W30.
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