Engine oil additives

[Fleckers]

Hi guys

Got a 2011 diesel turbo engine with 102000 miles on the clock

Has anyone any experience of Molyslip engine oil additives ?

Cheers

Stuart

[MorganP104]

I've never used Molyslip, but a few years ago, I had an Audi A4 Avant V6 TDi with an engine I thought was excessively noisy (even for a diesel). The car was quite high mileage, which I thought might account for the elevated noise levels.

My mechanic said there was nothing wrong with the engine, and the car drove OK, so I just put up with it.

Anyway, I came across an online advert for Extralube ZX1 Micro Oil treatment, which is a little bottle of additive you add to the engine oil, and it's supposed to reduce friction. It was only about £15, so I went for it.

Stuck it in the Audi, and within about a week, the engine was noticeably quieter. Still sounded like a diesel, just not a knackered one!

Haven't used it on any other cars, but would give it a go again if any of my high mileage cars started sounding a bit noisy.

[powerstroke]

Fleckers said:

Hi guys

Got a 2011 diesel turbo engine with 102000 miles on the clock

Has anyone any experience of Molyslip engine oil additives ?

Cheers

Stuart

Waste of money , modern oils are very good and
And have ballanced additives Most manufacturers
Warn against using additives ,
Best to use the correct spec oil and change
Regularly ...

[Mave]

Is there a problem with your engine that you are hoping to fix? If theres an issue at only 100k miles, I'd concentrate on fixing the underlying problem first.

[Fleckers]

Mave said:

Is there a problem with your engine that you are hoping to fix? If theres an issue at only 100k miles, I'd concentrate on fixing the underlying problem first.

Thank you for the replies

There is nothing wrong with the engine, but I have never had a high mileage car before, I change the oils on all my cars every 3500 miles and just wondered if additives were worth it

Cheers

Stuart

[Mave]

Fleckers said:

Thank you for the replies

There is nothing wrong with the engine, but I have never had a high mileage car before, I change the oils on all my cars every 3500 miles and just wondered if additives were worth it

Cheers

Stuart

To be honest, 100k miles isn't high mileage these days with regular servicing. 3500 miles oil changes is probably over the top anyway, absolutely no benefit (and potential for harm) in using additional additives.

[TarquinMX5]

If you're concerned about it, as well as regular oil changes, it might be worth trying a few tanks of something like V-power fuel or similar. It might help clean the fuel system / injectors etc..

[Lordbenny]

Fleckers said:

I change the oils on all my cars every 3500

I hope you don’t mind me asking....but....WHY?

It’s VW diesel not a Caterham!

Edited by Lordbenny on Friday 8th January 16:13

[Benrad]

Regular oil changes are good. I suppose additives might be useful sometimes, however...

If it has a DPF fitted then do not use oil additives under any circumstances. Engines with DPFs use low SAPS oil, additives add SAPS. Your DPF will block with ash sooner, especially if it's got high oil consumption.

Source, I develop diesel engines for a living (my job title is performance and emissions engineer!)

[Fleckers]

Lordbenny said:

Fleckers said:

I change the oils on all my cars every 3500

I hope you don’t mind me asking....but....WHY?

It’s VW diesel not a Caterham!

Edited by Lordbenny on Friday 8th January 16:13

I have always changed oil every 3500 my grandad told me when I was young always chance the oil and the engine will love you for it

Excessive maybe but it keeps me happy and gives me something to do

[Fleckers]

Benrad said:

Regular oil changes are good. I suppose additives might be useful sometimes, however...

If it has a DPF fitted then do not use oil additives under any circumstances. Engines with DPFs use low SAPS oil, additives add SAPS. Your DPF will block with ash sooner, especially if it's got high oil consumption.

Source, I develop diesel engines for a living (my job title is performance and emissions engineer!)

Thank you I did not know that

[Tony1963]

Fleckers said:

I have always changed oil every 3500 my grandad told me when I was young always chance the oil and the engine will love you for it

Excessive maybe but it keeps me happy and gives me something to do

You are aware of a thing called ‘progress’, surely? Engines have changed out of all recognition over the years, as have oils and fuels. All you’re doing is wasting more money than you might potentially save. There are plenty of million mile engines out there that have stuck to regular oil changes as specified by the manufacturer.

[Chris32345]

Tony1963 said:

You are aware of a thing called ‘progress’, surely? Engines have changed out of all recognition over the years, as have oils and fuels. All you’re doing is wasting more money than you might potentially save. There are plenty of million mile engines out there that have stuck to regular oil changes as specified by the manufacturer.

Most manufacturers set servit intervalves to keep fleet users happy by minimising cost hence why many have 18k between services these days
Personally I think 8-12k is more reasonable
But 3.5k is just plain wasteful

[KingofKong]

I do my oil/filter every 5k, but I’ve owned it from new and don’t intend to ever sell it.

I use Millers Ecomax every 3 or 4 fill ups too.

Probably snake oil, but works for me.

[Tony1963]

Chris32345 said:

Most manufacturers set servit intervalves to keep fleet users happy by minimising cost hence why many have 18k between services these days
Personally I think 8-12k is more reasonable
But 3.5k is just plain wasteful

Just bear in mind that Porsche, for example, have extended service intervals for the 911 Turbo S, and they’ll extend the warranty to 15 years (?). That’s confidence. A shopping car being treated like it’s a rare classic makes me chuckle.

[spikeyhead]

My Saab 9-3 TD died at 230,000 miles after being hit by a lorry.

It had 9 (NINE) oil changes in it's life.

[Tony1963]

I bet the engine was ok though!

[Mave]

Likewise, our saab 900 died in a crash at 200k, oil changed once a year, never had an engine wear related problem.