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'82 BMW 733i M30 - Which Oil #5163059 07/17/19 01:07 AM
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TXCarGeek Offline OP
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Have an '82 BMW 733i (E23) with the vaunted M30 engine running on L-Jet so it's an early version of the E23. I'm needing to change the oil because I picked it up as a project that wasn't running and there was a ton of troubleshooting that probably resulted in a good amount of fuel getting in to the sump. Everything runs fairly well now and I think it's time for fresh oil. BMW of course shows to run 20W50 in the climate that I'm in--Coastal Bend of South Texas-- which mean high heat, high humidity in summer time, and occasional freezes in the winter, say around mid to high 20s.

I'd prefer to stick to oils available OTC from Walmart unless there's an overwhelming reason to use something else. The oils available at my Walmart that I'm considering are Supertech 20W50 Conventional, Castrol GTX 20W50, Mobil Delvac 15W40, and Rotella T4 15W40. I don't feel a terrible need for using an HDEO being that my engine is low mileage and really clean inside, but I'm not opposed to it.

Out of these, which would you all use in a clean, not terribly leaky M30? Any other oils that I should be considering? Perhaps Valvoline VR1 which I can also get locally at AZ or Oreilly? Would prefer to stick with a conventional as I don't feel a need for a synthetic in this application given how I'll be using it though.

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163066 07/17/19 01:51 AM
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I'm not opposed to potentially using some sort of 10W40 oil as well if anyone have opinions for or against that.

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163076 07/17/19 03:05 AM
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My vote goes to the Mobil Delvac 1300 Super 15W-40 CK-4/SN. It carries a ton of OEM specs and unlike the Rotella it's dual-rated.

A 20W-50 is OK, but it's unnecessarily thick, has more VII than a 15W-40, and doesn't carry any OEM specs.


2020 Toyota Prius Prime XLE plug-in hybrid, 2ZR-FXE engine, ~ 4,000 mi
TGMO 0W-16 SN/RC Japan
OEM spin-on oil filter Japan
Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163079 07/17/19 03:24 AM
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Price is nice on the Mobil Delvac as well at $12.47 for the gallon jug.

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163083 07/17/19 03:45 AM
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JAG Offline
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That’s quite the classic car. How will it be driven, such as length of trips and how easy or hard?

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163109 07/17/19 04:57 AM
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ka9mnx Offline
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Not the same as yours but I had an '87 325 and the owners manual was more concerned with the HTHS of the oil than the grade used. Long time ago but if I remember correctly the recommended HTHS was 3.5 or higher.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163134 07/17/19 05:41 AM
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rooflessVW Offline
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I ran nothing but Rotella 15W-40 in mine.

Perform a valve adjustment and install new updated spray bar bolts or drill yours for safety wire.

[Linked Image]

Last edited by rooflessVW; 07/17/19 05:47 AM.

"Zed's dead baby, Zed's dead."
Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163142 07/17/19 05:51 AM
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aquariuscsm Offline
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How about qsad or pyb 20W50? I'm sure you can order them site to store from Walmart. Mobil 1 15W50 if you want a synth?


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 0W20

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163182 07/17/19 06:32 AM
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andyd Offline
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Old Car, low miles, 20w50 high mileage with a seal seller My '83 533i ran great but the valve seals are shot. The top oiler needs to be secured .as Roofless VW mentioned. A buddy called her 733i, the Bavarian Mare. Supertech or anything you buy @ WM will be fine.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163314 07/17/19 09:00 AM
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Rotella, Delo, Delvac, or SuperTech 15W40 are better than anything available in 1983.


make the inside of your engine oil cap white.
don't use.
Re: '82 BMW 733i M30 - Which Oil [Re: dave1251] #5163443 07/17/19 12:14 PM
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I've been using 10w-40 (Mobil conventional from Walmart) in my 1988 e30 325i with the M20 engine for about 10 years now and engine has run great, still no leaks. I think the engines are very similar. I'd imagine an HDEO 15w-40 would be fine too, but may not be helpful if the engine is already pretty clean.

Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163455 07/17/19 12:32 PM
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nthach Offline
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15W-40. This is no place for a SN/SN Plus rated 20W-50. The reason why so many older German cars can get away with an SM/SN 20W-50 is the higher NOACK/HTHS number.

Re: '82 BMW 733i M30 - Which Oil [Re: Vaca] #5163511 07/17/19 01:39 PM
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The M20 in my e30 is very similar to the M30 in your 7 series.
That being said, I'd recommend Rotella T4 15w40 as it has additional Zinc these old solid lifter engines need.
Other oils may be thick enough, but don't have the higher levels of additives (when considering a dino oil).
thumbsup


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Say "no" to Turbo!
Re: '82 BMW 733i M30 - Which Oil [Re: nthach] #5163521 07/17/19 01:47 PM
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rooflessVW Offline
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Originally Posted by nthach
15W-40. This is no place for a SN/SN Plus rated 20W-50. The reason why so many older German cars can get away with an SM/SN 20W-50 is the higher NOACK/HTHS number.

A modern 20W-50 will do just fine in the OP's engine.

I'm wondering what you think would be so detrimental.


"Zed's dead baby, Zed's dead."
Re: '82 BMW 733i M30 - Which Oil [Re: TXCarGeek] #5163532 07/17/19 02:01 PM
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10/40 for year round, 15/40 if its a summer only at my shop. Some ask for the 10/40 MoS2 from Liqui Moly.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI-T6 5/40
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
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