Hi MrMckay et al.
When I tried to research B&S oil I couldn't find its properties anywhere. It's prolly just re-branded and could well be made from partial recycled oil, which some say is as good as the dirty, black stuff they get out of the ground. Haven't really looked into it.
The Caltex SAE 30 looked really good, (zinc and phosphorus wise) but as petrol stations are mostly convenience stores now my local(ish) garage didn't stock it.
So availability was another reason to go with Penrite (and the specials).
Gadge, You explained catalyst poisoning well. Thanks.
Regarding multigrade; I understand "long chain polymer molecules, can get sheared into shorter bits" and then the oil reverts to the W side, but have also read: "The polymer additives do break down from thermal and mechanical degradation as the oil ages and wears out. This results in increasing the carbon build-up (sludge)." naturally go's on with why timely oil changes are important.
What are your thoughts on this?
Last edited by Bushie; 29/09/14 09:53 PM.
