Posted by INCase on March 02, 2023 at 08:47:55 from (209.221.240.192):
In Reply to: mixing engine oil posted by fastfarmall on March 02, 2023 at 07:42:17:
a good synthetic oil will not do that. they are compatible with conventional oils, but as others say you loose more benefits of watering down the synthetic that you ever gain.
IF turning to tar happened a cause could be that the synthetic oil cleaned a very dirty engine out and the gunk that broke loose and settled somewhere else is what they saw.
I've been an AMSOIL dealer for quite a while and the one car i didn't flush the engine out when i converted the car (after i bought it) from conventional (or what every the quicky lube place the previous owner used put in it) to full synthetic it plugged the filter after a coupe thousand miles and I had a light rattle at start up. swapped a new filter and no issues after that for about 100,000 miles before i sold the car. Since then i always use engine flush when switching. The older and dirtier the engine (and/or an engine that is not running right and has gas/fuel or antifreeze in the oil) could have that issue. maybe not but good chance of it.
not sure how the synthetics would behave if the old engine oil had stop leak or STP, lucas or other cure in a bottle snake oils in it.
for the $ blends are worth bothering with... having said that AMSOIL JUST came out with a 50%+ blend of diesel and hydraulic oils so.. ???
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