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My wake surf boat has a 2007 GM Vortec Indmar 8.1L L18 (~300hrs on it) that was originally spec'd for 15W40 oil but Indmar later amended the spec to straight 40WT. I contacted Indmar asking which synthetic oil they recommend and their answer was "We don't recommend using synthetic oil in that...

I have two Toyota V8s (2014 Tundra 5.7L & 2012 Lexus 4.6L) and am wondering if there are any high-quality 0W20s that might offer some advantages to the factory-fill TGMO 0W20 synthetic. Being an old school car guy with a thick head I still run 6k OCIs for these engines which usually equates to...

I have a 2015 BMW M4 with the S55 twin turbo 3.0L inline-six which I believe should perform well with the same type of oils that the previous N54 and N55 engines used. One difference is that my engine makes ~500HP (modified) so it will live a harder life compared to a stock 300HP N54. FWIW and...

Late model Jaguar / Land Rover with the AJ-V8 Gen III 5.0L that was originally filled with Castrol Edge Pro 5W20. My rig will see lots of sub-zero cold starts so my plan is to switch to a high-quality 0W20 synthetic. Good idea? Of these readily-available options in my market does one stand out...

I am very fussy when it comes to engine break-in so I decided to do a very early OC. The next OC will be at 2000kms, paid for by the BMW maintenance plan. Feedback on the results?

2015+ BMW M3 / M4 with 3.0L TT in-line six (S55) The factory recommendation is BMW Twin Power Turbo Longlife-01 FE SAE 0W-30 but I can't find it anywhere. The owner's manual says to substitute 5W-30 or 0W-40 and my local BMW dealer does have M TwinPower Turbo Longlife-01 SAE 0W-40 which is what...

My Audi 6spd manual calls for VW / Audi G052911A2 fluid. When the weather drops below -5C 2nd and 3rd gear syncros are not happy! Does anyone have the specs for this factory fluid? Maybe there is a good alternative for cold weather performance? http://www.ecstuning.com/ES465417/

I recently bought a used car with 60k that calls for M1 0W-40 as the factory fill but I would like to run a really potent cleaning oil for ~500 miles to clean the internals as much as is safely possible so I have a good baseline. Is there a high-quality oil that is known for having excellent...

I am now behind the wheel of a 2012 Audi S4 with GIAC AWE Stage 2 (~425hp) so I want to protect the engine with the best slick stuff! Warranty and long drain intervals are not a concern - the Stage 2 upgrade killed most of the powertrain coverage and my OCD personality means that I will never...

My Toyota 5.7 V8 + 6spd auto calls for Toyota WS fluid. Would changing to something like Redline D4 ATF or AMSOIL Signature Series Multi-Vehicle Synthetic ATF smooth out the shifts a bit? The shifts are often a bit harsher than I think they should be but a visit to the dealer and fresh WS made...

Can anyone suggest a correct synthetic ATF for '90s era Mercedes-Benz 722.3 4spd automatic in a 500E? It sounds like the current widely used standard isn't technically ideal for this older auto 'box that isn't computer controlled. I found this good info posted elsewhere but would like to know...

I have always been very careful with oil temps by not going above approx 3000rpm or more than ~50% throttle before my engine oil reaches full operating temp (~200F). My goal is to have every engine last as long as possible and waiting until it is fully up to temp before thrashing on it seems...

I have a Lexus LX570 which has the same V8 as the 2007+ Tundra/Sequoia 5.7L. Currently using the OEM Lexus/Toyota 0W-20 synthetic. Are there any compelling reasons to try a different brand of 0W-20 or 0W-30? Also, I am at ~60k miles and I know the PO often used the Toyota 5W-20 non-synthetic...

I have a new BMW M3 (S65 V8 - TWS factory fill) with an intercooled supercharger system that increases power to 650hp. Durning extended hard use or track lapping the oil temps run 10C to 20C higher vs the stock engine oil temps. According to other BITOG members the TWS is an amazing oil but it...

Toyota/Lexus 4.6L V8 The owner's manual calls for 5W-20 or 0W-20 but I want to use the latter. How does M1 0W-20 AFE stack up against the factory Toyota full-synthetic 0W-20? Oil cost and warranty aren't part of the picture, I just want the highest quality oil that offers the best protection...

I am looking for a light-weight, high-quality 0W-30 synthetic for my Toyota 4.7L V8 truck engine. The factory manual calls for 5W-30 but my engine is regularly asked to start @ -10F and every UOA I have ever seen shows how easy these engines are on oil so I am sure a good 0W-30 will be more than...

1994 Mercedes-Benz 5.0L V8 DOHC I have just completed a cleaning cycle with Rotella T6 5W40 and I want to move on to something better. My OCI will be 5k miles or six months. The choice is between Redline 5W40 and Motul 8100 X-cess 5W40 since both are readily available in my area. The Redline...

I just bought a 1997 Land Cruiser (80 Series) with 200k and I want to change all the fluids. AFAIK, the vehicle has always been run on dealer-fill bulk dino lubes. -Engine: I will use Shell Rotella T 5W40 -Diffs: Calls for Hypoid gear oil API GL-5 -T case: Calls for Hypoid gear oil API GL-5...

Oil experts. My engine is currently spinning along with synthetic 20W-50 and making the following oil pressures @ 200F: 85psi @ 4000RPM 105psi @ 6500RPM I think this pressure is too high since the factory manual states the spec as 60psi @ 4000RPM. Does anyone have an educated guess where my...

I plan to use Brad Penn 0W-30 semi-synth (great specs!) in a couple of my vehicles but a trusted source told me that these 'race' type oils with high levels of ZDDP can be harmful to modern catalytic converters. According to this source the cat damage is the reason that most modern API oils have...