good high miles engine oils.
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I am sure Castrol GTX HM will treat you right, I have been a Valvoline man most of my life but since joining this forum I have experimented with many oils. I have used Castrol GTX in the past and the car ran like it should, and I have used Motorcraft filters in the past and they work well. Feel free to go the uoa analysis section to see GTX in action what I mean is someone has probably ran this oil for at least three thousand and done an oil analysis. You will learn more than you have ever wanted to know about oil here.
Triple_Se7en
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Just stick with it. Depending on the issues, it may take a couple more OCIs to alleviate the problems or concerns.
Yes, GTX HM is an excellent oil; that's what I'd be running if MaxLife was not available.
Try Maxlife like mentioned above if it doesnt work dump it and go back to what your using.
Maxlife and Maxlife Synthetic
Wally's SuperTech HM 10w40 - runs smooth and definitely works on valve guide leaks.
What engine?
I use Maxlife 5W30 in my 180,000 van. It loves it.
1.6 liter 1988 Mazda 323 w/ 210k miles (been using HMs since MaxLife hit the shelves). The only time it's blown smoke (so far) on the Supertech was after it sat for one wk while we were on vacation. Otherwise can't see smoke but can smell it a bit. Before HM oils it smoked VERY noticeably the first few min. of operation. From my own experience, I rank MaxLife and Supertech above Castorl HM (I've used them all). The ST is performing excellent, but it's still early in the OCI to say for sure that it trumps Maxlife. W/ Castrol HM I often had some (though much reduced) smoke.
BTW, don't take my comparison of the HMs too seriously (very unscientific and long term memory) - Castrol may have smoked after it'd been in the sump for six months (?), while my present Supertech has only been in for about a six weeks - so I can't remember details of past HMs and I have very little data so far on the ST.
I'm about to be shamed off of BITOG. I was just out in my Mazda - stopped at a store for 10 min. got back in and had smoke plume on start-up. I've been praising SuperTech HM on several threads on here, went out on a limb for it, and now it proves definitely no better (perhaps worse at this rate - it's still pretty fresh oil) than Castrol or MaxLife for my Mazda.
Sorry for the mis-info!
Sorry for the mis-info!
The puff of smoke doesn't have anything to with the oil; it has to do with worn parts. Don't expect a particular jug or brand of motor oil to fix worn valve seals or rings. It isn't going to happen.
Yes, it does "fix it". Sort've kind've. It doesn't fix the mechanical problem, but it does fix the symptom (to some degree). Using regular oil my Mazda can put out smoke at start-up that can gas my whole front yard. HM oils take this to no-discernable smoke (best case) to light smoke. In my book that's a fix (for the time being).
ok, "whole front yard" was an exaggeration. But my pt stands.
You will never need a high-mileage oil at your mileage if the engine has been maintained with good oil and is running well. My 1996 4.6L Mustang engine has 226K miles and runs like new on 5W-20. It is noticeably slower on 5w30, and uses some oil in both cases. Top-end makes noise with the 30 weights on cold start. Previous owners used conventional 10w30 for 185K of the miles. Try a full-synthetic 5W-20 and see how it runs. You will like it.
^
Apparently you haven't seen the MaxLife commercial during the NASCAR races. It shows the neoprene valve stem seals being softened up and totally revitalised; it even welds the cracks back together.
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