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What can happen to a leaky engine if I just keep topping up the oil and not actually doing a drain and refill? The car is a 2000 Mazda Miata with the BP4W iron block, aluminum head 1.8L engine. The engine is not original to the car, which I didn't realize until some time after purchasing the...

Looks like another stellar report on my 94 Integra GSR that I've owned since 2001. 381,000+ miles on the original drivetrain, never rebuilt, and this was sampled just after a 1,000 mile road trip to Tail of the Dragon with plenty of 2nd and 3rd gear VTEC runs on the mountain roads. A little...

Hey all, my wife and I have owned a 2014 Mazda CX-5 2.5L Touring FWD (Skyactiv non-turbo) since Summer 2016, from 54K miles up to the current 132K-ish miles. I've used OEM Mazda Moly 0w-20 oil and OEM Mazda filters, changed every 6K to 8K miles or so. Since 2019 I've also had Blackstone UOA's...