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DIY Oil Change question

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Hi everyone:

About to embark on my first oil change since buying a 2000 C4 with 47,000 miles. THe DIY tutorial is fantastic but I need some clarifications.

1: what's the consensus on new oil. I know that Mobil 1 synthetic is the factory fill but I've also read in this forum that the Castrol Syntec may be a better choice and may help to prolong any impending RMS failures since its got more anti-friction compounds in it.

2: This question relates to the procedure of jacking up the rear of the car to get access to change the filter. If I put jack stands on both sides in the rear I would think that with the car leaning forward, I'm not going to get all the oil out. Please don't tell me to jack up all fours. If I do need to get all four wheels off the ground, what is the correct order for jacking.

3. Can anyone post a pic of a leaking RMS or just where the bearing is in relation to the rest of the car. I've got a small leak in the rear, seemingly under the AC compressor but its hard to tell without jacking up the car. I hope its not the RMS.


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1. IMHO either will work fine. Both are on the Porsche "approved" list.

2. I don't use jack stands to change the oil. I just drive up on 3 2x10 boards to get the little extra room I need to get the drain pan underneath and the filter out. Takes about 5 minutes (less drain time).

3. A leaking RMS and/or IMS seal will weep oil from the point where the transmission joins to the engine. Lots of pics here if you search but if there is oil dripping from the joining point then you likely have one of those two seals (or both) leaking.

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Mine is a daily driver and as these cars normally run hot anyway, it's magnified during hot summer and traffic conditions. This makes using a 5 or 15 50 weight oil a good thing to do to help protect your engine during these conditions. I don't think for my region and summer temps and age/condition of my car it would be good to run 0w-40 mobile water. Others might dispute that. Do a search and you'll find plenty of oil war threads here. Shift through and make up your own mind to what feels right for your situation.

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