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Swapping from fully synth to semi

Joined Sep 2009
131 Posts | 1+
skye
Just wanted to check this.

I'm switching oil tank for a replacement one and new oil filter. Been topping up with the remnants of oil from the last service, castrolGPS fully synthetic oil, but I've gone and bought motul 5000 which is semi synthetic this time.

I know u can't mix them, but is it ok when dropping the old oil anyway?

Do I need to do an engine flush? :dunno
 
I swap to Castrol gps 10w50 from Castrol half synthetic 15w50 no problem just better with full synthetic
 
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