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#1 (permalink) Old 07-17-2009, 06:56 PM
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Full Synthetic?

Is full synthetic motor oil required for a 1997 740i?
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#2 (permalink) Old 07-17-2009, 10:09 PM
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yes, as far as i know. ive been using mobil 1.
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#3 (permalink) Old 01-13-2010, 10:20 AM
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What weight are you using?
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#4 (permalink) Old 01-28-2010, 11:52 PM
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Given a choice of
Mobil 1 EP @ $12.68 per litre
Shell Rotellla Syn @ $10.37 per litre
Redline @ $24.31 per litre
What would you use in a E38 740iL??
http://cgi.ebay.com.au/Formula-Shell...item27aee74005
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#5 (permalink) Old 01-29-2010, 03:28 AM
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Quote:
Originally Posted by brettski View Post
Given a choice of
Mobil 1 EP @ $12.68 per litre
Shell Rotellla Syn @ $10.37 per litre
Redline @ $24.31 per litre
What would you use in a E38 740iL??
Formula Shell Full Synthetic Engine Oil 5W30 5.676L Box - eBay Other Engines, Components, Engines, Components, Car Parts, Accessories, Cars, Bikes, Boats. (end time 06-Feb-10 23:30:36 AEDST)
i can see where your at brett but im sure others will disagree
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#6 (permalink) Old 01-29-2010, 05:15 AM
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Mobil 1 for me....

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#7 (permalink) Old 01-29-2010, 10:42 AM
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Interesting. The PO did not use Full Synth Oil. So the first oil change I did I used Mobile 1.
my 93 740il started leaking a bit. So I tried Castrol GTX Synth Blend, no leaks. I've heard FullSynth on a high mileage engine will cause leaks. I guess it's true.

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#8 (permalink) Old 02-02-2010, 07:45 PM
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Big T's right changeover from regular to full synthetic on a high mileage will cause leaks and inadequate lubrication. My advice if it hasnt had synthetic yet then dont use it.
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#9 (permalink) Old 02-13-2010, 08:42 AM
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So the normal engine oil is a 10W40, is a 5W50 going to be ok?
Will it give a better range of temperature protection?
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#10 (permalink) Old 02-13-2010, 10:31 AM
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The only oil/weight that I found that matched the API rating in my owner's manual was Mobil 10W-30 non-synthetic motor oil. I have 135K miles on my car and don't believe it has ever used sythetic.
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#11 (permalink) Old 02-13-2010, 01:40 PM
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Now you've lost me...why ask the question in the 1st place when you know what your car requires ?????, if it has full BM history its always been given the required oil....10w/30 or 10w/40 will be fine, full syn/semi syn or mineral will all be fine....they all mix with one another...

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#12 (permalink) Old 02-13-2010, 02:58 PM
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I've heard conflicting views on switching from organic to partial synth/ full synthetic on high mileage engines.

Some say that it is bad because synthetic oil will slowly remove the organic buildup deposited by organic oil which supposedly helps keep the engine sealed. They say this causes leaks (like you experienced).

Others say it is good because of superior lubrication and operating temperatures, which they say adds HP due to a reduction of friction.

Its hard to tell which is the better option, and reading more conflicting views makes my head spin.
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#13 (permalink) Old 02-13-2010, 03:18 PM
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I am just trying to figure out whether 10W40 was the standard for the time the car was made, or if 5W50 or 0W40 was readily available, that would have been recommended.

Not knowing a lot about oils, does the 5W50 option offer the equivalent protection of 10W40 plus more, or are there trade offs with the wider range?
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#14 (permalink) Old 02-13-2010, 11:15 PM
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This will sound snotty but I always buy new and Mobil 1 syn always goes in at the 10 mile point. Waste of money maybe but 80-100.00 is cheap peace of mind.

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