Changing from reg oil to Mobil1?

[wingboat]

Want to do an oil change on my 2000 Boxster, and suspect the previous owner used regular motor oil. What should I do to make sure nothing diastrous happens when I refill with Mobil1?

I'll change the filter, of course. Cheap source for the filter would also be appreciated.

Thanks!

What makes you think the previous owner used conventional oil?

Conventional oils and Synthetics are compatible, that's why you see a bunch of blends in the market place.

You should use 0W40 Mobil 1. Your car will love you for it! Should run smoother and may get better gas mileage too.

I am sure some of the other forum members will tell you how to purchase OEM filters through the internet.

Wingboat:

You can also go to www.mobil1.com. They have a FAQ's about this subject.

This is an exact quote off the web site:



"Can different synthetic motor oils be mixed together?

Mobil 1 is fully compatible with conventional motor oils, semi-synthetic motor oils and other synthetic motor oils, should it be necessary to mix them. However, it is important to note that the superior performance of Mobil 1 will be reduced by diluting it in any way. "

[deliriousga]

Cheap source for OEM filters www.pap-parts.com

If the PO did use regular motor oil, I would change it to Mobil1 and then change it again in about 5K miles. There are blends, but they last about half as long as full synthetics so when you "create the blend" you should change it early and your next fill will be more pure.

[MNBoxster]

Hi,

As stated, MB1 is compatible with Organic Oil, so no problem there, just change it and go the normal interval.

But, whenever changing between any Oils, no matter what type, just Brands, there is the potential for some slight leaking at the seals. It is a fairly common wives tale that if you switch to a Synthetic from an Organic you'll get some minor seepage. This is basically true, but not because of the type rather the change in Brands.

All Brands use a proprietary mix of Anti-Oxidents and Detergents. These can be different Agents and/or be in different concentrations.

Over time, your Oil forms deposits along the edges of valve seals, valve guides, and gaskets. These deposits actually aid in sealing these joints. They are immune to the effects of the Oil you're currently running.

But, switch Brands (or types) which have a different composition or concentration of these Agents, and the deposits can be stripped away allowing for some slight seepage from the joints, or in the case of valve guides and seals, a little smoking from the exhaust.

These effects are temporary until the new Oil forms deposits of it's own, once again resealing the joints. Hope this helps...

Happy Motoring!...Jim'99

[Brucelee]

Hate to disagree with Jim on this but in all my years (40 or so) of driving I have never experienced a leak due to changing oils of any kind.

The theory sounds good but, with today's seals, I have not heard this theory advanced at all.

Having said all that, I would simply switch to M1 0W-40 and stick with that. It is a very high quality oil. I would also change the filter, of course.

Now, as to how often to change, well ..............