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Hi all, I purchased a certified pre-owned 2010 highlander in December with 40K miles on it. I am approaching 45K and am not sure if the differential and transfer case oils have ever been changed. I don't fall into the towing/severe service category for which toyota specifies a 30K mile...

I have a 2006 Hyundai Accent with 147,000mi on it. Has always had a bit of lifter noise on cold start-up. When the car was newer I tried Pennzoil platinum but switched back to PYB as the lifter noise was considerable louder for the first minute or so. Recently, I decided to try Pennzoil's...

I bought a certified 2010 Toyota Highlander with 40K miles a few months ago and soon noticed a distinctive knock on cold acceleration which diminishes as the engine warms up. Apparently the pistons in this engine have a short skirt and tend to rock a bit in these engines until they heat up and...

I have a 2006 Hyundai accent commuter that is approaching 147000 miles. It has been using conventional Pennzoil 5w-20/5w-30 every 3750 miles for most of its life. I'd say 90% of those miles are freeway. I've even used Auto-Rx at approximately 50 and 90K miles. It runs great and consumes maybe...

I have a hyundai accent with a 3.5 quart oil capacity (with filter). It has started developing some HLA noise on cold starts and Im contemplating using some Auto-Rx. The instructions now call for the full 12oz regardless of sump size. Will this be too much for the hyundai.

What's to stop a company from putting the better additive packages in conventional oil? Is the chemistry not compatible or is it simply another way to market the synthetics as "better".

My 06 hyundai accent with ~46K miles on it has developed an annoying "clatter" when cold. It seems to be louder when I let my foot off the gas and goes away completely after warmed up. Here is a link to video with sound. Is this piston slap, injectors, or normal...

Any issues on a 2006 hyundai accent with the oil being overfilled by 1/2 quart. The stated capacity is 3.48 with a filter and 4 quarts were put in. Gotta love the dealerships.

Im contemplating switching my 2006 accent over to synthetic at its 45,000 oil change. I have been changing the pennzoil 5-20/5-30 every 3750K miles (half of the manufacturers recommended 7500 interval). It's mainly a commuter, about 80 miles of freeway per day. I would like to be able to go the...

Her 2002 Jetta with a 2.0L has been fed a steady diet of dino 5w-30 and 10w-30 with OCIs of 3-5K miles (she let it go 9K miles once or twice in the past). It also consumes some oil between changes. I just finished a second Auto-Rx cycle at 94K miles. After reading some past posts, it seems that...