quote:Ah yes. The infamous sludge meister Australian GTX. How many Holden and Ford engines were wrecked by that crap ? That stuff almost destroyed Castrols reputation in this part of the world. It's only the last few years I've been using their products again, and then only their gear oils. Rick.
If an engine oil doesn't darken then its not doing its job properly. I remember once back in the early 80s seing an engine dipstick on which the oil was virgin clean and the oil had done 5,000 km (3,000 miles). When they took the drain plug out, no oil flowed out. They had to poke a screwdriver up the drain hole to get oil to flow out. They took the pan off and a layer of sludge like the skin off the top of a paint tin was all over the bottom of the oil pan. That was Castrol GTX SAE 20W-50.