How often do you change your oil?

I check mine frequently and always keep a few qts in the garage. If I were going on the road for a trip I'd store a few qts in a box in the trunk.
consumes up to 0.9 US qt (0.8 liters) of oil
over a distance of 600 miles (1,000 km). The
oil consumption may be higher than this when
the vehicle is new or if you frequently drive at
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The Best of Mercedes & AMG
(1) your head bolts will fail,
(2) you will automatically have the wrong size spacers,
(3) your tires will wear out,
(4) you will have purchased the wrong brake pads




Incidentally, driving mostly short distances in the city where the oil doesn't get up and STAY up at the usual 105 C for a period of time so some of the the water in the crankcase can evaporate is another reason to change it more often (water is a byproduct of combustion and it turns the oil acidic). Yet another reason to use an oil with a higher TBN if you mostly drive short trips.
Last edited by Diabolis; Jan 30, 2015 at 12:34 PM.
The P85D with its ~700 hp and 4WD is a different beast altogether. That will leave anything in the dust, but again it doesn't corner well because of all the extra weight.
Now, comparing the two is really more of an apples and oranges thing than anything else. The fact that Tesla has managed to build even the P85 is a great accomplishment; the P85D is on another level altogether. I'd love to own either one and use it as a DD. The problem with fully electric cars is that unlike a C63 you can't just stop by at the nearet gas station and in 5 minutes have juice for the next 350 km - the Tesla has to charge 1 hour for every 35 km, so 10 hours for 350 km (assuming that you have a 240V charging station, otherwise it's even longer). The ONLY thing holding back electrics is the charging time for the batteries, and unfortunately it's the big oil companies that are severely hampering the development of new fast-charge battery technologies. If it wasn't for the trillions of dollars that big oil makes annually, a $100 billion annual R&D fund could likely develop batteries that would make internal combustion engines obsolete in 5 years. Just as a reference point, big pharma spent $112 billion on R&D in 2013. Volkswagen on their own spent $11.4 billion (Daimler did $6.6 billion) - so it's certainly doable if it wasn't for the economic and thus political obstacles.



