Question about 1995 Chevrolet Blazer
5W30 It should be marked on the oil filler cap.
Posted on Nov 17, 2009
Testimonial: "Thanks a lot!!! I'll check the cap too."
Degreed, Licensed Mechanical Engineer PE Phd. here uses factory recommended oil viscosity (in this case 10-30wt) in newer vehicles but realizes that as the engine gets older and the tolerances between the moving parts (piston rings, rod & crank bearings, etc.) increase due to wear then at this point an oil with greater viscosity is appropriate. I use 10-40wt in older vehicles to provide increased protection and compensate for the wear on these older engines.
Manufacturer recommended oil can properly float the matching surfaces such as a crankshaft and rod or main bearings just fine as long as the gap between the metal remains the same. As the gap between the surfaces increases a thicker oil is much more effective at preventing contact between the surfaces. HOWEVER, do not use thicker oil in a newer vehicle as it will not penetrate the gaps between matching surfaces as it was intended and in general if you have to increase beyond 40wt in a standard passenger vehicle then it generally past time for a rebuild.
Good luck to all
Posted on Mar 10, 2010
Coolent in the oil
Posted on Mar 07, 2010
People are under the assumption that reading the oil cap on a car will give you the proper oil weight. Sorry but this is wrong. Yes they do help alot when the vehicle is new but keep in mind engine wear is a major factor in determining what weight oil one should use, so don't use the cap as a means knowing what weight unless your vehicle is new or has very little mileage. The higher the mileage the more protection you want. Engines wear just like anything else so they need more protection over time.
Posted on Dec 07, 2009
U can use either 5W-30 or 10W-30, if u live in a warm climate use the latter. any major brand will do.
Posted on Nov 17, 2009
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Posted on Jan 02, 2017
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