Whats your preferred oil

[kriskyk]

Where are you sourcing the 5w50 I've been looking but have not found a good source yet...

[PkB2014]

Where are you sourcing the 5w50 I've been looking but have not found a good source yet...

NAPA usually has it, and you can sometimes catch a sale. I got my last batch for $6/qt instead of the usual $10. Worst case you can get it on Amazon, but price is just normal $50-60/per case of 6, usually.

[ViperGTS14]

We are in the process of testing Liqui Moly engine oil, and are going to putting it in our engines here at Prefix.
This is a Europe based company and should be no problem for you guys on the other side of the pond!
Mobil 1 is always a good option as well!!

Curious how you guys like it, I've run Liqui Moly 5W40 Leichtlauf in w204 c63's which are prone to be plagued with valve train issues and helps greatly also helps remove a few degrees of oil temp. Going to purchase some for my Viper if it also helps with warm-up valve train noise.

[ViperGeorge]

mobil 1 and add extra qt for track cars running factory oil pan.

What weight oil do you recommend? Also won't overfilling run the risk of frothing?

[RCVIPER]

Pennzoil Platinum Racing Oil 10W-60 or Pennzoil Ultra 5W-40 was recommended to me by Dan Cragin
I also use the Mobil 1 as well... it's just a matter of which ones available when I'm doing an oil change.

[Larryskillzs]

Hello George
we run 0-40 mobil 1 ESP in 5th gen vipers with stock motors with factory oil pan track or street use. Same oil we run in our PWC cars; We are pretty impressed with this oil. If you have a built motor i would check with the motor builder most of them have specific weight you need to run.
Best source for Mobil 1 ESP oil is amazon since ESP is a new formula.
Extra quart is an old roadrace trick. Guys at bondurant school of driving used same trick to keep their school 5th gen vipers alive. No aeration problems or excessive oil in breather.

Why add an extra quart? I attended Bondurant in 2016 and spent a good 1-2 hours chatting it up with the techs. Their take on the Viper, it was the most reliable car they ever had. They did run a thicker oil, 15w-50. I asked them about the oil because I noticed oil pressure readings were higher on the Bondurant car compared to mine back home with Pennzoil 0-40.

They never mentioned to me adding a quart over for safety purposes. The techs at Bondurant checked oil levels after every day with date stamps and signatures. I poked around and saw them myself.

[Old School]

Given the choice, I'd rather have frothy oil than have the pickup uncovered.

I've got the same problem on my boat. If I don't run 2 quarts over, when accelerating, as the RPM is climbing, the oil pressure would be dropping. I'm pretty confidant, with 2 quarts over, the crankshaft is going pretty deep in the oil.

[ViperGTS14]

Wondering how much over we can run without causing other issues. 2 quarts does sounds like a safe amount, wondering what that reads on the stick

[Old School]

Just to be clear, the 2 quarts over I'm talking about is in my boat.

[Jack B]

Over filling robs hp (windage). Furthermore the aeration reduces oil pressure and disturbs the consistency of the oil film which can lead to bearing failure. As far as boats, this may be specific to a model, but, my twin 350 turbocharged Verado's do not like over filling, the forums are filled with warnings about too much oil.

[Old School]

Over filling robs hp (windage). Furthermore the aeration reduces oil pressure and disturbs the consistency of the oil film which can lead to bearing failure. As far as boats, this may be specific to a model, but, my twin 350 turbocharged Verado's do not like over filling, the forums are filled with warnings about too much oil.

Yep, I agree with all this. My boats a v-drive, which means the engine is mounted backwards, with the sump towards the front. I've got another pan in the garage, just haven't put it on yet (going on 8 years of overfilling).

[ViperSRT]

Over filling robs hp (windage). Furthermore the aeration reduces oil pressure and disturbs the consistency of the oil film which can lead to bearing failure. As far as boats, this may be specific to a model, but, my twin 350 turbocharged Verado's do not like over filling, the forums are filled with warnings about too much oil.

Absolutely agree. Excessive aeration can lead to dropped valves as well due to hydraulic lash adjusters with excessive aeration and increased valve closing velocity. Most engines cannot tolerate more than 10% aeration. Note that the bearing failure mode with excessive aeration is frequently bearing overtemp (resulting in bearing fatigue due to reduced mechanical properties with elevated temperatures) as the aerated oil reduces thermal heat transfer.