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I have a 1998 isuzu rodeo ,mil 235000 i run quaker state 5w 30 thinking of changing to quaker state defy 5w30 synthetic blend an was looking for some advice befor i do.
thank you
If its ok i also have full digital manual that covers 1999 to 2002 that im willing to share if it does not violate any of this website polices.
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For high mileage motors I think semi synthetic or even just good old fashion oil is the best to use.
This may seem like an obvious comment, but you got to 235K with what you were using. Why change now?
its my nephew and he believes alot of what he reads online, i’m trying to get him signed up hear with guys that have taking these products and ran them hard an long to see how they performed. So what i’m really looking for is solid advice that he can believe in and a sight ware he can come to and know when he opens his hood he’s got the right info from people that speak from experience and he doesn’t have to spend the extra time doing the trial an error that the rest of us have grown up with.
I can give him the shop and the tools and what i have learned but this community can give him so much more and its nice to set back and know im the one that put that first wrench in his hand and he grabbed on an never looked back.
Thank Ever one of you for the time and information that you share every day, when i started it was get some tools and figure it out.This can often be a very controversial topic. Eric made a really good video on this (found here), just in case you haven’t seen it yet.
But I agree with “dtidman”, I don’t really see a reason to change the oil now.
As long as you consistently change your oil, that’s the most important thing, the type of oil isn’t necessarily as important. Your car manual will likely say to use a certain grade of oil and then simply to use anything that is certified by the American Petroleum Institute (API) and has their little “starburst” or “doughnut” symbol on it.
Perhaps a “high mileage” oil to revitalize the seals could be helpful if you’re burning oil or have a slow leak somewhere. Definitely if you have a leak, I would recommend not swapping to a regular full synthetic (based on what Eric says in that video).
Overall, I’d say there is no reason to change, just keep doing what you’re doing since it’s working. Do regular changes and you’ll be fine. However, if you wanted to switch; using either a conventional or synth blend that is formulated for High Mileage and contain a seal conditioner probably at least wouldn’t harm anything.
***Just teach your nephew proper maintenance schedules, that will prevent the most problems in the long run. It’s the easiest and best thing you can do for a vehicle. No reason to only wait for a problem to do mechanic work!
Best of luck,
AldonThe most important thing is the state of the oil in the motor. You can put all the fancy oil in there you want, but if it goes 2 or 3 times the interval you’re negating any benefit.
[quote=”theguy” post=136622]I have a 1998 isuzu rodeo ,mil 235000 i run quaker state 5w 30 thinking of changing to quaker state defy 5w30 synthetic blend an was looking for some advice befor i do.
thank you
If its ok i also have full digital manual that covers 1999 to 2002 that im willing to share if it does not violate any of this website polices.[/quote]
In my opinion full synthetic is the best to use in most cases. When a blend is used you are
watering down the protection. No problems with you sharing the manual. We appreciate any
help for our forum members. 🙂 Just one guys opinion.I have two cars and they both get synthetic oil changed every 3000 miles. I figure if I care enough to spend extra on oil why shouldn’t I care enough to keep it clean.
For an older motor conventional all the way. Synthetic molecules are too uniform. Newer motors 2000-2005+ depending on vehicle I would use synthetic. STP treatment is necessary for older style flat tappet cams due to zinc(ZDDP) being taken out of motor oils. Without the zinc, the cam lobes/lifters will fail prematurely. I use Shell Rotella T 15W-40 and STP treatment for my oil changes. In your case I would stick with conventional quaker state.
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