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We don't have a "stock oil cooler", although the oil is routed through the plenum. When the coolant heats up, it tends to heat up the oil, which is counterproductive. We didn't touch the stock setup on the theory the extra capacity of the oil cooler will keep the oil cool enough and actually help a little with the coolant temps.
The big question is, where is the oil filter and the factory oil cooler in the oil circulation loop?
I think it would be best to get rid of the factory oil cooler completely, this might give slightly cooler coolant temps since it's not absorbing heat from the oil, and if the coolant is slightly cooler, it might help keep the oil temps under control too.
__________________ John Baas
2001 Anthracite Metallic M5
1997 Audi A4 - Too many mods to list
1991 VW Jetta - MegaSquirt/16V/ITBs
Interior
545i Short Shifter, UUC DSSR, UUC Clutch Stop, Autolumination Interior LEDS, PPI amplifiers (DSP Removed), Kicker Subwoofers, Polk/Boston Acoustic Speakers Exterior
Vosteiner Power Dome CF Hood, Euro Clear Corner Headlights w/Lamin-X, Umnitza Predator Ice V2, Umnitza 6K Headlight + Fog Light Upgrade, Umnitza V4 Side/Turn/License LEDs, CF Roundels, Black Kidney Grills Drivetrain
Magnaflow Resonators + 14815 Mufflers, Custom X-pipe, Spal Electric Fan + Controller Suspension
Kellener's Lowering Springs, 19" Black BBS CH Rims
Coming Soon
Custom Air Intake, SuperSprint Headers
The Following User Says Thank You to xr4tic For This Useful Post:
I think it would be best to get rid of the factory oil cooler completely, this might give slightly cooler coolant temps since it's not absorbing heat from the oil, and if the coolant is slightly cooler, it might help keep the oil temps under control too.
it also removes a heat sink from below the plenum.
Jerry, one thing i don't understand is your comment on warmer oil temps, how'd that happen?
__________________
Mike
91 M5 Alpine White II, Silver Gray 3/90 production
17x8/17x9 M system with PS2, 20mm touring roll bar; Ground Control Coilovers; EAT Chip, CD43; bmw/nardi blackline steering wheel, 3.8 Cam Gears
08 535i / 6 speed
Space Gray; Gray; Sport/Premium/Nav
00 M5 Ti Silver; Imola/black sportiv --Sold
Engine:
Supersprint Headers, Dinan CAI kit and MAFS, Throttle Bodies, Cams, Ported heads, Exhaust, Custom dinan software, Evosport Pullies, Dinan clutch and lightened flywheel; Ignition solutions plasma coils
Suspension:
Dinan Stage 3 with front and rear Strut Tower Braces, Beastpower Sway bar brackets, Dinan Wheels with 275/285 PilotSport, X5 Thrust arm bushings, Stoptech 355mm 4 piston front, 355mm 2 piston rear brake kit, Dinan 3.45 diff
Interior/Misc:
Eurodash, updated steering wheel, Bluetooth retrofit, Sirius Retrofit, hardwired V1, Widescreen Mk4 nav, M audio retrofit, Ice Link, BSW Stage 1 speaker upgrade, bmw towbar
it also removes a heat sink from below the plenum.
Jerry, one thing i don't understand is your comment on warmer oil temps, how'd that happen?
Not sure if it is variation in outside temps and humidity or a difference in the addition of the oil cooler. I notice what appears to be a slight increase under cruising mode.
As for explanation, I can only assume that when the new oil cooler t stat is closed, the temp will run slightly hotter, when open, it will help keep the temps in check. I don't know if the extra plumbing (more distance to travel) or the increased capacity (about a quart and a half) has any impact on temps.
Regards,
Jerry
__________________
'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
The thing is to have the correct oil temp for changing outside temps and humidity
which the stock system does an adequate job of. Problem is if you track the car, on a warmish day, you will overheat with the stock set up, assuming you're really driving. I've never had any issues on the street, but a summer track day, about 4-5 good laps is all it's good for before the oil and coolant temps start getting into dangerous territory.
__________________
Mike
91 M5 Alpine White II, Silver Gray 3/90 production
17x8/17x9 M system with PS2, 20mm touring roll bar; Ground Control Coilovers; EAT Chip, CD43; bmw/nardi blackline steering wheel, 3.8 Cam Gears
08 535i / 6 speed
Space Gray; Gray; Sport/Premium/Nav
00 M5 Ti Silver; Imola/black sportiv --Sold
Engine:
Supersprint Headers, Dinan CAI kit and MAFS, Throttle Bodies, Cams, Ported heads, Exhaust, Custom dinan software, Evosport Pullies, Dinan clutch and lightened flywheel; Ignition solutions plasma coils
Suspension:
Dinan Stage 3 with front and rear Strut Tower Braces, Beastpower Sway bar brackets, Dinan Wheels with 275/285 PilotSport, X5 Thrust arm bushings, Stoptech 355mm 4 piston front, 355mm 2 piston rear brake kit, Dinan 3.45 diff
Interior/Misc:
Eurodash, updated steering wheel, Bluetooth retrofit, Sirius Retrofit, hardwired V1, Widescreen Mk4 nav, M audio retrofit, Ice Link, BSW Stage 1 speaker upgrade, bmw towbar
Recent question of why oil may run slightly hotter with my setup.
I checked with my installer, who checked with his inside BMW source. No real explanation other than slightly different atmospheric conditions and possibly the extra capacity of oil keeps the heat slightly longer. But they did confirm that the OBC temp sensor is slow to react, so when I see 93-94C, it just a slow reacting temp sensor. So that would tie in with slightly higher heat capacity and slightly longer to shed it.
I did a few runs and when the temp hits 93 -94, it will suddenly plummet to 88. This is the Tstat opening up, probably shortly before I see the slow reacting temp sensor info on board.
Hope that helps.
Otherwise, car is running great, just turned 78k. Just waiting for the SC kit to come out...
Regards,
Jerry
__________________
'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
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