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Chevrolet Cobalt Question about oil?
harrisblack
Member Posts: 28
Which one to use?
Pennzoil Platinum full synthetic
Mobil 1 full synthetic
Castrol full synthetic
Royal Purple full synthetic
Pennzoil Platinum full synthetic
Mobil 1 full synthetic
Castrol full synthetic
Royal Purple full synthetic
0
This discussion has been closed.
Comments
Engine Oil-A Slippery Subject
What about the air cleaner and the fuel filter? What brands?
For air filter the AC/Delco has been known to be among the best in protecting your engine. Test after test it has been proven to trap more dirt than any other. Wix brand are supposed to also be good with oil and air.
I thought I saved it but I can't find a recent lab test showing the AC/Delco air filter superior to all others. Not only is it very good at flowing air but it traps more partical than any other.
You are making a blanket statement about spin-on filters. You can't compare a spin-on to a cartridge. I also like AC/Delco, but people have to reallize the Ecotec engines don't even use spin-on oil filters. I've used AC/Delco, Hengst, Fram, and Purolator on my Ecotoecs. I still like the AC/Delco the best. It seems better made and the pleats don't "shred".
Almost ALL spin on auto oil filters use paper as the filter medium. What is unusual about the Fram filters is that Fram uses paper for the end caps. Other brands have metal end caps that the pleated paper is seated in, and plastisol is used to provide a seal. Fram uses a dense, felt-like paper instead of steel to make the end caps, and they use glue to achieve the seal.
Tom
The steel end cap has a lip on the outer cricumference and a concentric lip inside of the outter lip. A layer of plastisol is dispensed into the trough in between these lips, and the pleated paper filter cartridge is seated into the plastisol. Then heat is applied to cure the plastisol and the paper. That is the traditional method for getting "end seal" on spin-on oil filters.
You can decide for yourself which method would give the best chance for a good seal.
Tom
I think your must be talking about the faulty anti-drainback valves that were found in some Fram filters a few years ago. I'm assuming they have corrected the problem, but I have nothing to back that up.
Anti-drainback valves allow oil to flow into the filter, but not back out of the filter. The only way oil is supposed to be able to leave the filter is through the center tube, after passing through the pleated filter paper that surrounds the center tube.
The purpose of the anit-drainback valve is to prevent the oil from draining out of the filter when the engine is shut off. If the filter were mounted vertically and right-side-up, then the anti-drainback valve would be unnecessary, but most filters are mounted horizontally, which means that without any pressure in the system, the oil would run back out of the filter to the crankcase.
The problem with letting the oil drain out of the filter when the engine is shut off is that the filter would have to fill up again when the engine is started before any oil would begin circulating to the moving parts. Those few seconds without oil flow at every start-up of the engine would have a cumulative effect in shortening engine life.
Tom
The dirt holding capacity may not be much of a factor, if you are on a 3000 mile drain interval, but the quality of construction, the performance of the anti-drainback valve, and the amount of time the filter is in the by-pass mode (like on cold starts), are not necessarily going to be the same across the brands.
Tom