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Old 13-09-2009, 11:31 AM
69coupe 69coupe is offline
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Oil mixing ?

I use 25-50 Castrol Edge oil in my 502, Castrol say this replaces the original GP 50 not available now. Having plenty GP50 still left , I was wondering if I could use it top the 5 litres of 25-50 on the next oil change. I reckon about another 1 litre of GP 50 would go in.
Both are Dino oils. Can you mix engine oils ??
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  #2  
Old 13-09-2009, 11:40 AM
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BlackoutSteve BlackoutSteve is offline
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Yes, you can mix oils, but you tend to try not to. Oils are designed to be compatible with others as they expect consumers to top up on a different brand. Something to do with why they are a polyester base..

Anyway, is the GP50 a single or multi-weight? I think I remember it being a 25W50.. Should be just fine. If you're worried, save it for your daily or your lawn mower.
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Old 13-09-2009, 03:29 PM
69coupe 69coupe is offline
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Anyway, is the GP50 a single or multi-weight? I think I remember it being a 25W50.. Should be just fine. If you're worried, save it for your daily or your lawn mower.[/QUOTE]

Steve
GP50 is single weight
25=50 Multi
I guess all that will happen will make the oil slightly thicker which ok for summer
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Old 13-09-2009, 03:33 PM
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Single weight? What were you doing using that stuff?
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Old 13-09-2009, 04:54 PM
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oils can be mixed (as already pointed out) as can trans fluid as long as they are similar grades.
25-50 would be fine in the 502, I wouldnt have recommended the straight 50, that would be better in an very old harley or ford sidevalve.

Never mix coolant though, always stick with the same brand.
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Old 13-09-2009, 05:42 PM
69coupe 69coupe is offline
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Originally Posted by blackoutsteve View Post
Single weight? What were you doing using that stuff?
Left over from my old Group A racing days. GP50 was king for endurance racing. Multi looked liked water at 230c plus. We use to heat the sump with heater before firing up. On a cold winters day you could undo the sump plug and nothing would come out - true story !!
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Old 13-09-2009, 07:28 PM
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OK, good excuse. Single weights have no place in any engine today.
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