On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
Fully synthetic is better, especially an Ester or POA based. Most cheaper synthetics are hydrocracked mineral oils and are not as good as these (but still better than a mineral or semi)
One problem with semi synthetics is that you have no idea how much synthetic you are getting mixed into the mineral base stock.
You could argue the extra expense of full synthetics isn't worth the outlay, especially on a road driven car.
All oils have come a long way in the last 20 years or so, and partly because of this engines don't wear out anywhere near as quickly as they used to even with cheaper oils.
You might get 160,000 miles out of a TS on semi synthetic before a rebuild, you may get 200,000 miles on the same car running a fully synthetic. If the car is falling apart elsewhere at 160k then it wasn't really worth the extra outlay to make the engine last longer.
I used to run my TS cars on Gulf Formula G 5w-40 (hydrocracked fully synthetic) and they went very well on it, I also tried Texaco 5w-40 synthetic and the engine was very happy on that also.
The Triple QX fully synthetic 5w-40 from Eurocarparts for £17 or so is a lower spec synthetic oil but the engine will be fine on it.
You will never be cool driving a Vauxhall.
Last edited by symon; 1 Week Ago at 16:57.