Castrol 03093 GTX 10W-30 Conventional Motor Oil - 5 Quart by Castrol

Product Information

For any type of heavy duty use such as those you mentioned, I would definitely be using the Rotella or another HDEO for the reasons electrolover lists. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. Assuming the most recent post by the OP is meant to say that he didn't add oil this OCI, and considering that this oil almost certainly starts as a low 30-grade, the viscosity is not bad at all. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. I can show you uoa of rotella in my shared sump bikes but gtx cannot be compared because it can't be used in a shared sump bike because of friction modifiers.

We use cookies (and equivalent technologies) to collect and analyse information on our site's performance and to enable the site to function. As a gently-driven DD which is using no oil, I don't see a whole lot of reason to change what you're doing. It has evolved to meet the needs of consumers and vehicle manufacturers since 1968 and continues to innovate and remain a trusted brand today.Cant comment on synthetic i really dont know how to read your UOA, if nothings wrong there should be no problems with synthetic. Also this is my first UOA and i couldn't get enough oil as stated so they were not able to do the flash point test. for some of you it is only a opinion with absolutly no facts to back up your statement,but it makes for interesting reading. Subarus have more trouble than many engines with staying clean internally, which is a significant factor in why so many use so much oil. If your car needs SAE 10W-30 engine oil, Castrol offers a range of options, all of which flow like 10 Weight oil when cold, and 30 Weight oil at full engine operating temperature.

If you want to clean it, either run Auto-RX according to its instructions, or else run RLI (Renewable Lubricants).

Personally, if you don't have some specific reason to switch, just keep running what you're running, but maybe back off the miles to ~3000. Sludge can block your engines vital oil-ways like cholesterol – and if untreated it can rob an engine of its power and ultimately, its life.

OP, if you decide to do something to 'clean' the engine, don't waste your time believing that any old synthetic oil will clean it.

Castrol® GTX® is a premium conventional motor oil that has been helping to extend engine life for over 50 years.