quote:
Originally posted by JohnBrowning:
Yes you will still need auto-rx. While synthetics are super clean compared to dino oil they still evaporate and leave behind deposits. My Dad had to replace a chain tensioner on his 2.7L Tacoma. We decided that it was a good time to replace the chain and gears seeing how you have to darn near dismantle the engine to get to the tenioners. His truck had 107,000 miles on it and they were all hard miles. The other then 2-3 oil changes the trucks entire life it has been run on M1 15W50. The engine was clean enough to pass for freshly machined parts until we got to the pan. The bottom of the pan had a film that was about as thick as honey and very very black. It flowed but flowed very slowly and it was almost the consistency of aloe vera gel. It was not abrasive feeling at all and all of the oil had been drained prior to removeing the pan. The vechile had been sitting for a few days before the pan was removed. It wiped clean with just paper towels and did not require any solvent to clean out. I would imaging that another 40,000 miles and that would have turned into something more like sludge.