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Modding Your Car? Oil Advice!


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30 replies to this topic

#21
CaptainK

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I got that advice from the 306 forum and having it thicker will mean when engine is hot and run high revs it stays thick, it works ok for me.

Gosh, that was nice of myself to post that on the 306 Forum. ;) B)

But yes, I do a lot of short journeys too and its recommended to go with a thinner "cold start" oil. Thats the number at the starts of the oil spec - e.g. a 10w40 would be a "10" when at "cold". The lower the number the easier the oil will circulate when you first start the engine, and obviously oil getting to moving bits quickly is good for the engine. The later number relates to how thick the oil is when at "running temperatures". The higher the number the thicker it is - generally for the UK climate anything higher than a "40" is to be avoided unless you regularly do track days etc as the engine temperature will be running much hotter than normal. As my quote above says I use a 5w40 oil personally. To be honest it doesn't matter an amazing amount in the UK climate as long as you have 10w40 or better, just don't rev the nuts off the engine for the first 5-10 mins of driving. :lol:

#22
SurGie

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I see what you mean about the velocity etc but here is what it says on the back of my Silkolene 10W/50.


"It exceeds the performance requirements of many engine manufacturers. Combines exceptional anti wear performance and outstanding high temp protection with excellent cold start characteristics. Suitable for use in turbo charged and normally aspirated to ensure continued maximum fuel economy and reduced emissions"




This is why i bought it for my 306 gti6 as well as the recommendations.

Edited by SurGie, 06 July 2010 - 04:53 PM.


#23
CaptainK

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The 10w50 will work fine if thats what you want to use. However, I still believe a "50" oil is far too thick for normal road use for a N/A engine. Turbo'd big power engines and on cars used a lot on track then yes, as engine temps would be greater then and thus you would need the viscosity of the "50" to stop it going pete-tong.

I used to use a "50" in my FTO (the exact Silkolene 10w50 you mention) thinking it'd be better. But manfufacturers spec for both the FTO engine and 205 engines I believe is a "40", so I started using the 5w40 especially as I sometimes did short journeys. No point going higher than that in the UK Climate as the oil will just remain a tad thicker when at engine operating temps - which actually increases fuel economy and emissions to turn the oil pump to overcome the friction of the the thicker oil being circulated around the engine.

Do you also plan on changing the 10w50 to something thinner for the UK winter ? The 10w50 for UK winter use in our N/A cars may be far too thick and take a fair few miles of driving to get upto correct running. Thats what concerned me most on my daily drives to work in winter - that the "50" wouldn't get up to speed very well in the cold. Also the "5w" part of it for winter use is good as it makes it "thinner" at cooler temps and thus allows the oil to more quickly circulate around the engine in the cold winters from the moment you first turn the key.

#24
SurGie

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I'm thinking of getting some of the 10W 40 fully synthetic for the winter, my oil temp in my 306 GTi6 gets to 90 after around the 3 miles mark and does not go any lower unless its very cold outside. I always let the engine warm up well before i high rev it and i dont go over the 3 k mark until it reaches the 90 temp. Today it went to the 100 mark driving around town. My water temp is around the 90 to 110 mark around town driving and at 70/80 on longer journeys and in winter on any type of journey just about.

Im just worried that if the oil is too thin when high revving and in the summer months it could do some damage to the crank, this happened to my MI16 2 years ago. So do you think 10W 40 is about the best all rounder during both seasons ?

There's so much to think about when choosing the right oil for the right spec and use.

#25
CaptainK

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The GTi6 gets hotter in the 306 does it ? Mine doesn't get that hot in the 205 surprisingly.

Anyways, if you want some examples of high revving in the summertime without any problems - my last fill of 5w40 in my 205 GTi6 included (on the same oil) :

1) An "interesting" 205 Eurotrip last year in May where it was rather warm and included visiting 10 countries in 10 days including deep down south down to Croatia etc where its much hotter than the UK.
2) That same oil also did 25 laps on the Nurburgring on a separate 'Ring Trip over the Easter Weekend last year..... and last year's easter weekend at the 'Ring was immensely overhot to the point my tyres were dying after 2 laps of the ring.

So personally for me, I think the Silkolene Pro S 5w40 has proved to me it can stand up to a lot of high revving in very hot situations. :)

On a more serious note, I think Peugeot's manufacturer spec is a 10w40 for the UK. So the 40 is what they are saying as well, but I just chose a 5W as it means it'll pump better around the engine from first start, especially in the cooler winters. The 10w50 will be fine as well for normal use, but on the flip side of thinking about it the extra viscosity of a 50 whilst high revvings might cause too much oil pressure to build up. Who knows really ? All I know is that my FTO ran happier when switching from 10w50 to a 5w40. I too got the 10w50 for my FTO thinking it'd be better for its high revving nature.

The best thing for you to do is do like I did - try out various oils and see what you like the best. :lol:

#26
lukesaddy

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Hi, i need some oil advice for my 2 cars please, money is no object i want the best possible protection.

1 - 2001 306 HDi (2.0 8v turbo diesel) its got 185,000 miles on the clock, which oil should i be using in this for normal day to day driving.
2- 1988 205 1.9 GTi, 85,000 miles on the clock. It isnt getting used yet but will be subject to some spirited driving down the back roads when its restored.

I want a good midrange make for the diesel and a top class one for the 205, both will be getting serviced every 5/6000 miles and the Gti will be getting a 200 mile run through with cheapo oil first as its been sat for about 10 years.

thanks,
Luke.

#27
bazil_205gti

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Hi

have got a low compression s16 engine s/c the cams arent new but the rest of it is, just after a lil advice on type of oil to run it in with, would a cheap mineral halfords 15/40 be alright? also reading this was thinking of going for a good quallity 5/50 for when its all run in? as its s/c and will be running about 300bhp

matt



#28
ftoomsh

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Castrol Edge everytime it has FST (fluid strength technology) it is 40% stronger than other oils. In an independant test 2 identical engines were bench run. 1 had edge the other a well known msport brand. Each engine ran at full rpm til destruction. The 'other oil' engine ran for a very impressive 93 hrs non stop max rpm. However Castrol Edge engine ran for 143 hrs Ooooooosh!!!

#29
petert

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You can't conclude from that test that oil was the cause of failure if no other analysis of components is provided.  Especially when you don't name the other oil. Hardly what you'd call independent lab testing.



#30
welshpug

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Can't have been a Duratec, they would have dropped a valve well before then :lol:



#31
Daniel306

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Is Titan pro Race 5 a good choice for a forged 406 Sri engine running +350 hp?