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I says "5-w30 provides optimal fuel economy,30 in 5w-30 indicates the viscosity of the oil at operating temperature. An oil with a higher viscosity may be better suited if the vehicle is operated at high speeds or under extreme load" Question is.....what is "high" speed? 70 MPH or higher?

First 2 years maintenance is "free". I receive the maintenance vouchers in the mail from Toyota. I noticed the first visit is only for tire rotation and no oil change. [censored]?? Oil change interval is 10,000 miles according to the vouchers. I look in the owners manual again...no where does it...

My owner's manual says "5w-30 provides the best fuel economy" Then it explains how a multi viscosity oil works. Then it says "a higher viscosity oil is recommended if you do high speed driving or the vehicle is driven under a heavy load." But it doesn't say what heavier oil to use or what they...

5w20 Vs 5w30, Response from Toyota May Suprise You.. -------------------------------------------------------------------------------- Disclaimer to the Flamer: This thread is not intended to stir up a debate, it is for information to others who may be interested in hearing what Toyota's...

Other than the weight what is different about the 5-20 spec oil for Honda, Ford etc. over 5-30 oil?

I last used the traditional green coolant in a '96 f150 because that is what it came with. I changed it every 2 years and when i sold it in 2004 with 120,000 miles the cooling system was in excellent condition. So why bother with all the boutique coolants?

Anyone here use the Motor rad T'stat that is supposed to fail open so as not to damage the engine by over heating?

I have a 2000 dodge grand caravan with the flex fuel 3.3 v6. The owners manual says to use a "special" mopar oil if using E85. What is the special oil? A synthetic

If the makers of any synthetic motor oil are so confident their oils are superior to dino oils why haven't we seen a side by side severe duty or normal duty test on the dynamometer or other wise to prove it?? Or has it been done and I just missed it?

If the makers of any synthetic motor oil are so confident their oils are superior to dino oils why haven't we seen a side by side severe duty or normal duty test on the dynamometer or other wise to prove it?? Or has it been done and I just missed it?

What ever happened to Synpower oil treatment? I can't seem to find it anywhere local any more.

I see a lot of folks wanting to switch to synthetic oils on high mileage engines. I don't understand the logic behind it. Can someone fill me in? I mean if you made it to 150,000 plus miles on dino why switch?

I am confused on the new GF4 oils. Are they thinner even though they are labeled 5-30 ...10-30 etc. Did they give up anti-wear additives to protect emissions components? I have read past posts on the subject but what is the final bottom line? Should I keep buying SL or dive into SM Dino?

Purchased new GTX at wallyworld today, prices are higher. Bottle says exceeds GF4 and SM. Stuff smells a lot different than the SL. Be carefull though the old stuff is mixed in with the new and the same price as new SM 5w-30. 5 quart jugs of syntec blend are on sale at about the same as GTX...

My first experience with asian products. The oil filter on My Tundra sure is small (V8). Is there an over sized filter that will fit and not void warranty? Is one even necessary? Thanks.