stp oil additive
Discussion
Many years ago I was running a 1275 cooper S on a tightish budget it developed a very distinct bottom end rattle but I had to run it for a further 10 days to attend a prize giving bash + pre engagement get away weekend, drained the engine oil changed the filter and part refilled added 2or 3tins of stp and topped off to correct level [ engine was hot] started it up still rattling but much reduced ran for ten days at reduced velocity then stripped the lump ,big ends well through the white metal into the copper backing, mains similar but not as bad had crank measured by trusted recon man while holding breath and crossing every thing to be told Its perfect no wear no ovality no taper !! rebuilt it with new brgs and oil pump, a rebore to 1308 cc and after the first 100 miles thrashed it unmerciful for another 2 years. Moral there is nothing wrong with STP or Wynns and may be others drain your engine to half level top up with new oil and carry on I very much doubt you will harm it
Sorry, I should have made clear that I have only added a single bottle of stp oil additive via the oil filler cap, not that I have filled the entire sump with the stuff!
My query was whether the fact that I had used the additive intended for petrol engines rather than the correct additive for Diesel engines would harm the Diesel engine in any way?
My query was whether the fact that I had used the additive intended for petrol engines rather than the correct additive for Diesel engines would harm the Diesel engine in any way?
My view on all additives is that if anything in them was necessary or helped a manufacturer's sales in such a competitive market then the oil companies would put it in oil to start with. They're not so bloody stupid as to deliberately make bad oil with bits missing with the aim of losing market share. They also have by far the biggest research budgets. If some magic elixir did exist they'd be the ones to find it.
As for shagged engines continuing to run with STP in them it's vanishingly unlikely this was anything other than a thicker mixture taking up the worn clearances better - or even that the engine would have soldiered on anyway with careful use, we'll never know. A good dollop of 140 grade gear oil would no doubt have done the same thing.
And to the OP, I'm afraid your engine will almost certainly now blow up within the next few days. I mean petrol engines and diesel engines are sooo radically different. For instance petrol engines have pistons in them whereas diesel ones have unicorns with silver tassels in their manes. At least that's what a bloke down the pub told me. He was horizontal at the time mind you and spilling a lot of his Special Brew but he still made a lot of sense.
As for shagged engines continuing to run with STP in them it's vanishingly unlikely this was anything other than a thicker mixture taking up the worn clearances better - or even that the engine would have soldiered on anyway with careful use, we'll never know. A good dollop of 140 grade gear oil would no doubt have done the same thing.
And to the OP, I'm afraid your engine will almost certainly now blow up within the next few days. I mean petrol engines and diesel engines are sooo radically different. For instance petrol engines have pistons in them whereas diesel ones have unicorns with silver tassels in their manes. At least that's what a bloke down the pub told me. He was horizontal at the time mind you and spilling a lot of his Special Brew but he still made a lot of sense.
Pumaracing said:
My view on all additives is that if anything in them was necessary or helped a manufacturer's sales in such a competitive market then the oil companies would put it in oil to start with. They're not so bloody stupid as to deliberately make bad oil with bits missing with the aim of losing market share. They also have by far the biggest research budgets. If some magic elixir did exist they'd be the ones to find it.
As for shagged engines continuing to run with STP in them it's vanishingly unlikely this was anything other than a thicker mixture taking up the worn clearances better - or even that the engine would have soldiered on anyway with careful use, we'll never know. A good dollop of 140 grade gear oil would no doubt have done the same thing.
And to the OP, I'm afraid your engine will almost certainly now blow up within the next few days. I mean petrol engines and diesel engines are sooo radically different. For instance petrol engines have pistons in them whereas diesel ones have unicorns with silver tassels in their manes. At least that's what a bloke down the pub told me. He was horizontal at the time mind you and spilling a lot of his Special Brew but he still made a lot of sense.
whilst i agree (in particular the unicorns, the spread of the diesel engine would explain the reduction in sightings) what about zinc? most modern oils have very little zinc additive compared to the good old days. As for shagged engines continuing to run with STP in them it's vanishingly unlikely this was anything other than a thicker mixture taking up the worn clearances better - or even that the engine would have soldiered on anyway with careful use, we'll never know. A good dollop of 140 grade gear oil would no doubt have done the same thing.
And to the OP, I'm afraid your engine will almost certainly now blow up within the next few days. I mean petrol engines and diesel engines are sooo radically different. For instance petrol engines have pistons in them whereas diesel ones have unicorns with silver tassels in their manes. At least that's what a bloke down the pub told me. He was horizontal at the time mind you and spilling a lot of his Special Brew but he still made a lot of sense.
LarJammer said:
whilst i agree (in particular the unicorns, the spread of the diesel engine would explain the reduction in sightings) what about zinc? most modern oils have very little zinc additive compared to the good old days.
If you are running an older or competition engine that could benefit from higher ZDDP content and you either don't run a cat or can accept shorter life than you can buy oils for the job without resorting to magic potions from Halfords (e.g. Millers Nanodrive). If you are driving an average road car, you presumably don't want to cat to fail prematurely...
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