is 5w30 good for a 92 Eunos?
Discussion
Currently I've got Fuchs Titan fully-synth 5w40 in my 1.6 92 Eunos, but looking in Halfords oil guide they recommend 5w30 semi-synth as manufacturer standard, or 5w30 fully-synth as optimal, so I got 4L of Castrol Magnatec 5w30 fully synth.
Before I open it is this oil going to be OK to use in the car during summer?
It only gets fairly infrequently (<3000 miles per year) use but when out it does get driven fairly energetically.
Before I open it is this oil going to be OK to use in the car during summer?
It only gets fairly infrequently (<3000 miles per year) use but when out it does get driven fairly energetically.
Mazda themselves apparently suggest owners should use a decent 5w30 oil as apposed to 10w30 if they have any sort of engine tap on startup.Even if you don't, it will be fine imho.On the other hand, some have had tapping using 5w30 and 10w30 has cured it, so a lot will depend on the car!
I had the HLA (tapping) noise when i bought my '94 1.8iS 4 weeks ago.
A can of Wynns oil flush into the old oil, got it red hot and ran it for a couple of hours on and off, then drained.
Replaced with fresh Mobil 1 0W/40 oil (Costco bargain @ £28 for 5 litres) - result, no more tapping whatsoever!
A can of Wynns oil flush into the old oil, got it red hot and ran it for a couple of hours on and off, then drained.
Replaced with fresh Mobil 1 0W/40 oil (Costco bargain @ £28 for 5 litres) - result, no more tapping whatsoever!
personally i wouldn't use 5W-30 in a 92 engine.
it's a fuel economy ford spec oil which has been retrospectively recommended for ford family engines that in some cases weren't designed for it. it's thin at high temps which you don't really want on a 20 year old engine.
won't do damage necessarily unless you're pushing it, but there are just loads more suitable oils out there (0W-40, 5W-40, 10W-40, 5W-50, 10W-50 etc)
it's a fuel economy ford spec oil which has been retrospectively recommended for ford family engines that in some cases weren't designed for it. it's thin at high temps which you don't really want on a 20 year old engine.
won't do damage necessarily unless you're pushing it, but there are just loads more suitable oils out there (0W-40, 5W-40, 10W-40, 5W-50, 10W-50 etc)
mybrainhurts said:
Why wouldn't it be ok? All Mondeos from Mk111 run on it.
i'm not quite sure how that's relevant?most 5W-30's are an ACEA A1/B1 spec i.e. fuel economy spec. as well as the 30 grade (thin) they have a special low high-temp bearing viscosity (HTHS) which makes them extra thin - this is not much good for your bearings. the '92 mazda engine was not designed for this A1/B1 spec oil and if you check the handbook it will specify an ACEA A3/B3 oil
skinny said:
i'm not quite sure how that's relevant?
most 5W-30's are an ACEA A1/B1 spec i.e. fuel economy spec. as well as the 30 grade (thin) they have a special low high-temp bearing viscosity (HTHS) which makes them extra thin - this is not much good for your bearings. the '92 mazda engine was not designed for this A1/B1 spec oil and if you check the handbook it will specify an ACEA A3/B3 oil
That's what I said (but without any understanding of what it all means most 5W-30's are an ACEA A1/B1 spec i.e. fuel economy spec. as well as the 30 grade (thin) they have a special low high-temp bearing viscosity (HTHS) which makes them extra thin - this is not much good for your bearings. the '92 mazda engine was not designed for this A1/B1 spec oil and if you check the handbook it will specify an ACEA A3/B3 oil
). Thanks for the clarification 
Gassing Station | Mazda MX5/Roadster/Miata | Top of Page | What's New | My Stuff