NewbietoVettes

I wonder what you guys think about the possibility of oil usage being higher than normal, due to the flat plane crank. I had a 2016 GT350 and it used a quart of oil every 600 miles. Ford sent out free oil filters letting owners know that this was normal. I know the LS6 has been in the race cars for two years, but this isn’t likely something we would hear about before we buy. Not comparing a Mustang to a Z06, just my experience.

mikey

I own the only other model Corvette with DOHC. C4 ZR-1. If oil guzzler tax was a thing then it would've been a candidate. A quart per 500 miles is not uncommon if you use the engine the way it was intended by the engineers. Highway cruising on long road trips does not consume nearly as much though.

Warp Ten

I understand how a Direct Injection engine uses more oil .. due to cylinder wash ... but how can an OHC cause more oil consumption?

stvdman

It has little to do with DI or OHC. Its RPM.

From 6500 to 8500+ rpm there is a LOT more going in in those cylinders wrt oiling. Plus the time spent at say 4500-6500 in the FPC engine is MUCH MUCH more. You will find yourself there pretty often compared to a motor that has a 6500 redline.

JillyBean

I had to put a quart in on my Panamera turbo every 3K

oaktreebc

Who knows. On just about every German sports car I could give a name of someone who has to add a quart every few thousand miles to never having to add.
BMW, Porsche, Audi, Mercedes - they can all burn oil up to a quart every few 1,000 miles and it's "normal".
Next, someone will probably start spewing, if you follow proper break-in procedure you won't burn oil, but I could show you numerous "experts" that disagree on how to break-in a sports car.

stvdman

Internal pressure high due to turbo.

Build has something to do with it for sure (piston to cyl wall clearance coupled with ring packaging) plus other stuff I dont fully comprehend. But, internal cyl pressures from C/R whether it be n/a or turbp-s/c play into it as well as crankcase pressures.

One way OEMS seem to approach it is OIL viscosity and additive packages.

MitchAlsup

I think your worries are (should be) overblown.

I have a mid engined sports car with a redline of 8500 RPMs. I use those RPMs, I see no oil consumption at al*l both long road trips, and track days. So, it can be done.

(*) The dry sump has a 2Qt margin +Max to -Min. If/when I fill the oil sump to +Max, the car will consume oil until it reached ½ way on the dip stick (around 1,000 miles), then the car will not consume any oil over the rest of the OCI (more than 3,000 miles)

This car has 1mm top rings and 1.2mm 2nd rings on the pistons and the bores have some kind of special (Mahle) coatings.

GordyRay

I have a Porsche Turbo S that doesn't use any extra oil, but my previous two naturally aspirated Porsches used an extra quart every 2500-3000 miles. My current Corvette C6 427 doesn't use any extra oil but my C6 Z06 uses an extra quart every 3000 miles, and yet they have the same engine. I am still stumped on the cause because my new Turbo S should be gulping down oil, but it isn't. So, the lower RPM C6 Z06 should not be using oil like it is so it doesn't follow the description as discussed above. I guess it comes down to the particular specs of the engine. I break in all my cars the same way.
Go Figure?

Rkreigh

the way this engine scrapes the oil and scavanges with the dry sump I think you'll find it does a much better job of oil control

any super high rpm engine can experience some problems with crank case back pressure due to the crankcase thrashing and blow by pressure getting by the rings

I think chevy did a really good job mitigating this on the lt6

keeping the oil from roping around the crank does wonders. Take a look at the oil pan in the lt6

MitchAlsup

It is a lot harder when the crank case runs below atmospheric pressure.

NewbietoVettes

Thank you for all the input. I'm hoping they have thought of this and solved any potential problems.

Rkreigh

so far the lt6 really seems to be better engineered with individual block bays and scavenge stages and baffling to keep the oil out of suspension.

The cooling looks to be well thought out and this is more of a race engine for the street that looks to be durable and able to run WOT without melting down

time will tell.

Red Mist Rulz

The GT350 engine burn oil because of a design flaw. As I understand it, it's only the 2015 through the first half of 2018 models that have the problem (and not all of them). After that Ford changed something.

FPC and DOHC don't automatically translate to oil use. I've had DOHC motorcycle engines redlined at 12,000 rpm that never used a drop of oil between changes.