Mobil 1 in the '93 SD outside overnight, 5*, glow/crank/run just like always.

I had the 300TD outside last winter as the garage was being used by drivers and a project, decided to start it when it was -18F just for grins, glow/crank/start just like it should, ... idled rough after the afterglow timed out though.

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Gone to the dark side

- Jeff

Synthetic doesn't cause leaks, but it can exploit them.

An article in The Star a few years back (20?) talked about this and that the leaks will leak more (wet seal becomes a drip) due to the synthetic oils not turning to thick goo when cold so they continue to leak, also different seal swell rates come from different oils (there are spreadsheets out there to show the different rates from different oils). If you pick an oil that has a lower swell than the oil an old car has been used to, you will have a leak until you switch back (same with automatic transmissions, and why Trans-X and other solvent-based additives swell the seals back into shape and reduce leaks and problems.
The short answer is (and was also mentioned in The Star) that you can switch back to dino oil if you "create" a leak, and it should shortly go back to its previous state. A longer truth to that is that most good synthetics will dissolve a lot of the gunk and crud that your engine might be using as a "seal", ... which won't grow back.

Was this an oil thread? I hope I'm not starting something bad.

Hey the good thing about black oil is how easy it is to see the oil level on the dipstick!!

__________________

Gone to the dark side

- Jeff

Synthetic doesn't cause leaks, it finds them.

*edit* looks like someone already beat me to it^^^^^

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k