Wanting to run HPL in my focus st , I have ran premium plus in the past. I am seeing a lot of people jumping on the No VI oil and since I have recently upgraded the turbo I am looking for the best protection. The motors are known for lspi and I noticed premium plus mentions it combats it while the NO VI does not . I know either will be fine more than likely but I just want opinions. Premium plus 5w30 or NO VI 5w30 ?
Focus ST oil
- Thread starter 05rsx911
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I run the base HPL PCMO 5W-30 & 5W-40 in my wife's Fusion 2.0. Great results. Have UOA's posted here.
That is a 2 liter??? Isn't that way out on the very little worry scale? 1.4T and 1.6T are the ones that have LSPI issue from what I have read. I myself had what I think is a LSPI event (1.6T) and survived it when my car was weeks old. It was not tuned at that time and was 100% stock then.The car felt like it jumped 5 ft in the air and landed hard, After the event and the next 5 seconds I thought "Well I will be getting a warranty motor" was going on in my head. But the car was idling fine after that and ran ok. Happen right were it was suppose to happen to the floor, low rpm 1,500 to 1,700 rpm and 17 psi at the time, wham!!
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I’ve used no vii and premium plus in my bigger turbo Fiesta ST and it worked well. I’ve posted UOA’s here on both
And you are going to upgrade the turbo?
More boost but at higher rpm... could reduce the LSPI risk.
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I'd say the Motul 5W30 if one can find it.
It's possible the issue got worse as the average engines aged. Fuel injectors performing worse, more oil making it into the combustion chamber, and aftermarket tunes aiming at reducing turbo lag...
LSPI is very specific situation different than detonation or pre-ignition the more typical issues with tuned turbo engines. LSPI is more associated with very small displacement turbo engines.
Most of the customization on ECU tuning is related to optimizing for fuel quality in your local area. I've not heard of these issues in the STs.
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On Focus and Fiesta ST’s lspi isn’t super prevalent but it does occur.
Mostly people with stock cars running 87 octane and flooring it in 6th gear going 60 mph but I digress
I think folks are confusing standard det/knock with LSPI which are quite different.
Preignition is detonation. I’ve read where people try to differentiate between the two but have yet to see anyone do so. When my Mazdaspeed6 detonated during a low rpm event, lspi was just starting to be talked about. Cole Mazda brought out an engineer to investigate my vehicle. When he said lspi I asked what it was. After he stated his explanation I just said “so preignition or detonation”. His response was only “yes”.
In that cars case it was a weak hp fuel pump & looking back, possibly oil chemistry from 2008 as well as a piss poor pcv system flooding the intake with an oily carbon mess that needed walnut shell blasting every 45k mi(or less).
Curious if the definition of lspi has evolved over the last decade and a half
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From what I remember:
- Detonation/knock is the fuel mixture unevenly combusting or only partly combusting. You get an uneven flame front or an exploding event/rapid uncontrolled ignition, but it's typically still initiated by the spark plug.
- Preignition is the mixture igniting before the spark plug fires, usually due to combustion chamber deposits. Engines that would "run on" were effectively running due to preignition.
I think they DO often get lumped together however and it could be argued there's some crossover.
With LSPI, you have the mixture igniting spontaneously before the plug fires, and due to what is generally high load (so lots of fuel + boost) and the position of the piston/rod in the stroke at the time (probably approaching or at TDC at the time of this violent eruption of the air/fuel) it will often completely destroy the piston.
Violent detonation can also crack/damage pistons, even if it's initiated by the spark plug.
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