JakeCV

Has anyone experienced low end engine rattling (diesel type sound) on start up after switching from Motorcraft oil and filter to another brand? Before my last oil change I never had this noise and have always used Motorcraft oil and filters. However, the last oil change I switched because of a free (rebate) offer for PEAK Oil and a Purolator filter with anti-drainback valve. Now I’m getting some bottom end engine rattle on startup that lasts about 3-5 seconds.


I’ve run Purolator filters in other vehicles with good luck. I was under the impression that they are a well made and respectable filter. I’ve also looked into the quality of PEAK oil online including Bob is the Oil Guy website. All indications are that it is a good quality oil – some analysis says it exceeds the performance of Penzoil.


Anyhow, I’m thinking about draining it out and replacing it with Motorcraft. Any thoughts or similar experiences?



PS: The engine in a 1999 4.6 with 130,000 miles and I’ve always run the recommended 5W30

Bert

I had that happen on a 1980 302 and it was a defective oil filter.

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Bert

jwko

Before draining it out why don't you try switching back to a Motorcraft filter and see if it stops. Be sure to top off the oil if you do.

PS: Isn't the Motorcraft oil a Synthetic blend? What about Peak?

JakeCV

Yes, I believe the Motorcraft is a synthetic blend and this is not. I didn't think that would make so much of a difference. Dang those good deals can get ya sometimes. I was feeling a little poor that day or I wouldn't have gotten it.

I'll try switching back to a Motorcraft filter and see if that makes a difference. Would it hurt adding a quart of PEAK synthetic oil to it and making my own blend?

Thanks

Actually, I think the Motorcraft Oil I used for the first 100k or so was not a synthetic blend, but the more recent ones have been. Can you still get non-synthetic or non-synthetic blend Motorcraft oil?

jwko

I'm not sure about switching syn blend with conventional motor oils, but I have heard switching to and from fully synthetic and conventional oil can cause temporary oil leaks. Won't hurt the engine as far as I know.

As for adding Peak synthetic to the Peak conventional oil & making a blend, I couldn't tell you on that one.

It would probably be easier to change it again with the Motorcraft oil & filter. I'm not saying whats in there now will hurt anything, but at least you'll have peace of mind :)

I think all Motorcraft oils are syn-blend except for the heavy duty oils.

Bert

I've switched back and forth with no leaks. I'd just change the filter and see what it does. I've added regular oil to my syn oil and visa versa with no problems.

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Bert