It is a fine oil, I have used it off and on depending on sales.
Most conventional oils now contain some group 3 in their blend to meet SN requirements, the line between semi-syn and conventional is thinner than before.
Which one, GTX 5/30, 10/40 or 15/40? They also have some HM versions of GTX.
Castrol Magnetec which is only sold in the EU as far as I am aware is slightly better, but GTX is still a good oil if you don't use it for too long. Castrol Edge is better for longer OCI's.
This is the list of GTX HM oils: Castrol HM oils
That's interesting as it has a lot of Sodium, probably Sodium Sulphonate, which I presume is used as a dispersant and anti corrosive.
I don't like oils with Sodium compounds, because it makes detecting a head gasket coolant leak from a UOA more difficult.
Hi,
Dually - Castrol's GTX designation has been around since the early 1970s.
It is their "bulk"consumer product. Castrol/BP have kept it up to date with basic API ratings and it is a good product in its intended applications. Now that BP is 50% (part) owned by the World's largest Oil Co (Russian) I expect it will contine as it has for the last 40 or so years
It has good "shelf" recognition amongst the average purchasers
I used it for 20 some thousand miles in my Ex V8, 5,000 mile oci's. and when it was torn down for a head gasket replacement the engine internals were very clean.
But GTX SynBlend is probably a better value at just $2 more for a jug at Walmart.
personally not a fan. back 5-10 years ago it was pretty much the only oil on sale down here in the south, but that has changed thankfully for the better.
I saw a motor torn down after 100k of castrol gtx and it was pretty sludged up. It was a 350 out of a 94 Z71 and the guy always changed it oil every 3000-3500. Motor was rebuilt at that point and all he has run since then is Mobil 1. Truck now has 340k and it runs like a champ. Hard to argue with results!
Originally Posted By: Georgiaboy2109
I saw a motor torn down after 100k of castrol gtx and it was pretty sludged up. It was a 350 out of a 94 Z71 and the guy always changed it oil every 3000-3500. Motor was rebuilt at that point and all he has run since then is Mobil 1. Truck now has 340k and it runs like a champ. Hard to argue with results!
I doubt the oil was at fault. I recommend you research a bit before you post something like that.
Also Pennsylvania crude has a lot of wax in it for candle's.