justin_o_guy2 wrote on 07/20/16 at 02:46:31:


This mainly comes from true synthetics, as some are not compatible with conventional oils... like mixing oil and water.
Most synthetics we get nowadays are just super refined conventional.  So the tail end of one won't get in the way of a fresh fill... much.  But you're much better off sticking to a single oil rather than mixing.

In the late 70's and early 80's I remember using the early 2 stoke synthetics. When they'd meet up with Dino oil, they'd turn into a white goop that looked like Mayonnaise. Clog up the whole oil injection system. You had to completely flush the old stuff out when switching from synth to dino or back.
I think people 'remember' that, and apply it to modern 4 stroke oils. It never was true.
Every time I teach a Motorcycle Maintenance class or do a tech seminar, the question comes up. I hold up a bottle of Synth/Dino blend and ask 'If it's ok for the stuff to be in the same bottle, it prob is ok if you mix them up in your engine'.

verslagen1 wrote on 07/20/16 at 09:29:45:


Dang, have I been saying t1 this whole time?!? darn, why am I a human, I meant just rotella t triple.


I'm a dumby.

justin_o_guy2 wrote on 07/20/16 at 16:20:55:



It is impossible to make people understand their ignorance; for it requires knowledge to perceive it and therefore he that can perceive it hath it not.
Jeremy Taylor (1613-1667)​