Did a Motorflush with GUNK motorflush and change oil WOW!

[Cloudsurfer]

Not to fuel the oil debate, but as far as I'm concerned, the best stuff you can put in your car is either Redline or Motul.

I would also absolutely get that 10W30 out of your car, both since it's too thin, and since it is diluted with solvents.

[bigborian]

Just picked up 2, 5 quart jugs of Castrol Syntec Full Synthetic from Walmart $21 woo! And picking up an STP oil filter from Autozone on monday. Gonna change oil again this Friday only ran about 200 miles on it so far by friday maybe 250 miles so it should be good to go I'll report on how it feels after the 2nd oil change.

[rob76turbo]

LB...

When you say cheap oil, what are we talking about? Synth oil is pricey and we are talking about running it 30 minutes max. And I have not seen many "dino" oils that are either 0W-40 or 5W-40. So do think it is okay to run a Penzoil, Quaker State type oil for that short cycle?

[Lil bastard]

Originally Posted by rob76turbo

LB...

When you say cheap oil, what are we talking about? Synth oil is pricey and we are talking about running it 30 minutes max. And I have not seen many "dino" oils that are either 0W-40 or 5W-40. So do think it is okay to run a Penzoil, Quaker State type oil for that short cycle?

OK... I think a little clarification is in order before I get to your specific question.

I do not advocate flushing the motor as scheduled maintenance or a preventative measure, and I don't want to give the impression that everyone s/b running out and buying motor flush for their cars. Anytime you run solvents through the engine there are risks.

Risks of excess wear, risks of causing leaky seals (because the 'crud' often aids the seals), risks that some of the dislodged deposits would block vital oil passages, etc. And, it is expensive (relatively so with all the oil/filters used etc.).

So, only if the engine needs it - is very high mileage and tired would I personally flush it.

It is not a cure-all and a well maintained engine with proper, regular oil changes using a quality oil won't usually require it. I mean that's one of the main functions of the oil - to capture combustion byproducts and hold them in suspension til the next oil change, something it actually does pretty well.

To just go and do it on the theory that "it couldn't hurt" is a false cost/benefit and the money might well yield more benefit if say it were spent on new plugs, or a coolant change.

All that said, to answer your direct question; if your car meet the criteria, and/or you are willing to assume the costs and risks of performing the flush, then I would say that you want a quality interim oil. Afterall, it's still flowing through your precious M96. 30 min. may not seem like a lot of time, but it takes just a fraction of that to starve a bearing or create permanent wear. When added up, this is a fairly costly procedure, no getting around that, and I cannot tell you what oil you should put in your car.

OTOH, you can always take a sample of the interim oil and run it through a coffee filter to see how much gunk is in it, and if satisfied, always reuse the interim oil in a less cherished (and possibly more robust) daily driver, your lawn mower (probably a lifetime supply given the quantity), etc.

[Brucelee]

When I buy any car with an older engine and/or I am not sure of the service history, I will do a few quick interval oil changes right out of the gate.

In you case, you might go to Wal Mart and get their syn oil. Run it 3000 miles three times. Assuming you drive a decent amount of miles, this will perform a safe "flush" without the risk of your engine detonating.

I do the same with auto trans. I am NOT a believer in the flush. I simply drain and refill more frequently than the manual says. This also seems to work well.

As Lil said, flushing is NOT without its risks.

[bigborian]

i bought my car from a used car dealership and when we got it we were thinking of doing a short interval oil change, It had 76k miles on it. We drove it maybe 500 miles and decided to change the oil and it was black. It seems the dealership hadn't changed the oil in a very long time. We put 10W-30 in it then mobil 1 full synthetic.

When we changed the oil just a few days ago the oil still looked good nice golden brown color. We drained a quart then put in the motor flush, idled, then drained the rest of the oil out and the oil turned black. We put in 10W-30 Mobil 1 full synthetic for high mileage vehicles and that's where we are at now. We are going to change the oil out this friday with Castrol Syntec full synthetic 10w-40 and an STP filter I'll let u know when i'm done. I'll also note the color and the look of the oil at the final oil change.

Walmart has an abundance of good oils at a reasonable price if you're going to do this i reccommned shopping there. They had more than Castrol brand 10w-40 but i decided to go with Castrol.

[bigborian]

update on motorflush. Just did my short interval oil change at 400 miles. I drained the almost new mobil 1 high mileage synthetic 10w-30 and it still looked new. Still viscous and still yellow-brown color but that's what i was expecting anyways. Took off the filter and the same thing there still looked brand new but changed it all anyways.

A few things i did notice after the motorflush and 10w-30 was the engine temp after coming off the highway and sitting in traffic temps got to about a little over 210 maybe around 215-220 but still within good range.

I drained it all and changed to 10w-40 Castrol Syntec Full Synthetic motor oil, Changed the oil filter and all. Feels just as good however i did notice temps were cooler after coming off of the highway or driving it hard. Feels pretty smooth i like it! This was my experience with motorflush, i guess it's not that popular but if you've got a car that you don't trust was taken care of properly this might be one way to consider to clean your engine.