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'02 Honda Civic, 85k, not on warranty. Is there any reason not to mix in 1 qt 5w-30 to 3 qt 5w-20 in an oil change? Oil is all Pennz YB, I just have a jug of 5w-30 left and no 5w-30 cars any more.

This is a Wix 57047 cartridge filter taken from a 2007 Toyota Sienna. Wix 57047 filter pic Note the cracks across and all the way through the end sealing material. The cracks were on one side only. Oil was Pennz YB @ around 4000 miles / 3 months. I don't have as much faith in this new system...

My wife has a 2007 Toyota Sienna with 3.5 v-6. I put in a magnetic oil pan drain plug at the first change, and changed oil 3 times with Toy filter and Pennzoil YellowB 5w-30 every 4000 mi. Almost nothing on the magnet each time I changed oil. Then I used a free oil change coupon at the dealer...

Hi, Live around Louisville, Ky. Mower engine is a Kohler Command 16hp, they say use 10w-30 due to hyd lifters. Engine has a full pressure lube system. 10w-30 seemed a little thin for an air-cooled engine on a hot day, always used straight 30 in 4 cycle air cooled engines in the past. I have...

Hi, I can't get Chevron anymore, still have some left, will have to mix with Havoline to use it all. I'm thinking this is no problem, but then again I've been wrong before. What say you? Thanks in advance.

As for the new SM oils, I really want someone like Laurence Olivier to get his dental drill going, strap the tribologists to the chair and ask them "Is it safe?". I'm getting the creepy feeling this time around, going from SL to SM oils, that new isn't really improved, and the SM oils aren't a...

So what makes a high mileage oil different? From Pennzoil/Chevron data sheets, the high temp viscosity is about halfway up to the next grade. So if I want a 10w-30 high mileage oil change I use 3qt 10w-30 and 2qt 10w-40 regular oils, and I don't pay an extra 50 cents per quart. What else am...