Jibby, just cause a car has good comp doesnt mean you use thinner oil. I see where your coming from, but dont say that. It leads to premature engine wear, if someone took what you said for truth.
Run the viscosity recommended.
Hey Tacoma, I said the combination of things so I disagree with you -Again, it all depends on the climate the car is driven in and the age and condition the motor is in.. Such as if your driving the car in the hot desert or the cold snow? I believe a new motor should use what the dealer recommends, and yes you absolutely right Tacoma with the newer cars with lower miles......However, 10 or 15 years later and 100,000 or 200,000 miles later that same original motor maybe ready for a slight change in oil wieght and grade.. Last I checked this thread is not talking about newer cars only...
This should help prevent further and faster engine wear, oil consumption and help maintain engine compression to some small degree.. An example: just look at all those stop oil burning products that are thick as molasis and lined up on the auto shelves in stores...Oh, and all the auto stores sell them........I am sure you've seen those products and I personally don't like them or use them but that is the extreme to validate my logic....
Too thin of oil on worn rings and the oil will seep though and burn out the exhaust and you will not be saving the life of your motor but be only spending more on adding more oil regularly to your motor.. It all depends my friend..
Too further this conversation, if you are concerned about premature engine wear when using different oil weights - as most know most engine wear occures at start up or when the oil is cold and thick.. As the engine warms up the oil is thinner and flowing and lubricating as normal.. However, they do sell some oil additive products that claim to bond and lubricate better even at start up... Mixed in with your oil it could be a good idea to use some additives on the older motors too...
Oh, and tacoma I would never suggest anyone to use thinner grade oils then what the dealer recommends for that car.. Good compression simply means no need to use thicker oils is what I was really trying to say...
I personally believe and some may disagree but the best combination is full sythetic oil blend with a good additive to go alone with it.. It has worked for my motor running on nos and it still purs and runs like new today... I believe if I only used the dealer recommended oils since I owned this car it may be a slightly different story.. Just my take...