I use Mobil 5w30 in my Lexus IS300, and have been thinking of making the switch in the RX7. Is seem as though most use 10w30 or 15w50. I have been seeing more and more Manufactures (Germans) going with a 0w-40 or 5w-40 (or 50 in come cases) as the specified oil, and more oil companies promoting a 15w-50. I even know Greddy has a 10w-60 and say its good for rotaries...

And are you guys still using the Metering oil pump, or premixing?

 

i use idemitsu, great stuff

 

I dont drive the car much nor do i NOT change the oil when needed so i go with the off the shelf 10w-30 all year round.

Maybe someday when my car is ready for the track, ill look more into oil properties but if your car is mostly street driven, 10w30 or 20w50 in the summer is just fine.

I actually got a sale for a 5 quart jug mobil 1 clean 5000 10w30 at autozone for 10.99 so i bought that.

Normally i use castrol gtx 10w30.

In my altima, i use whatever is on sale. (oil and filter sale)

 

I use 10/30 because Costco has it pretty cheap. My climate is pretty moderate, so no need for a heavy or super light mix.

 

Thats were I get mine for the IS, or sometime Pepboys or Advance auto has a 5qtw/mobil filter for $30 (great deal), but I strictly use OEM Mazda filters for the RX7. My 7 only sees the road typically April-Nov, 40-90F, however more so in the summer, but where I live the summer are hot in humid upper 80's/90s with high humidty (cooler humid mornings 60-70degrees), so I was thinking a heavier weight (15w-50) would suit better, or perhaps there 5w-40 for those cooler times and better for the engine all around especially during startup, but still has the viscosity for operating temps.

My car has not been on the road for a year, but when it was and for the past 4 years I used Castrol 20w-50, but after doing a bit of research the 20w when cold is a bit on the thick side, most wear happens during the startup or cooler temps.

 

I have been using the mobil1 10/30 and everything seems just fine... I made the switch to that from gtx 10/30 for over 4 years and with 30k miles the last compression test was A+++ I also do the same as you and only use oem mazda filters.

 

i use 5w20 royal, works good no grinds or smells like the otheres

 

Please post if you are using the metering oil pump or premix, and if possible leave the votes to Mobil1 users only, you are welcome to chime in on a different synthetics as some has already, if you are one of those please mention if using metering oil pump or premix.

 

Mobil 5-30
OMP and Premix

 

ive been runinng mobil 1 10/30 with mobil 1 oil filters for almost two years now in my rex. would recommend anything else... also i am premixing, if you wanted to know?

 

Sorry, my omp is still in use and I also premix.

 

Mobile 1 10w-30 in spring and fall, 15w-50 when it's hot. I use the OMP, but a little supplimental premix for the occasional autocross.

 

Same. Mobile 1 + OMP + I usually mix some MMO with the gas and oil.

 

Just switched to Mobil 1 15W-50 from 10W-30 after extensive opinion/data searching
FC Purolator PureOne filter, stock OMP.
I have the Pineapple stage 3 oil mod from the engine rebuild.
The car only really comes out to play during the summer now, so I'll probably stick to only 15W-50.

 

according to mazda workshop manual:
temperatures that are from 32F and higher should use 10w 30
lower temperatures than 32F should stick with 5w 30

 

MAZDA FSM also instructs you to change plugs from above.

As mentioned previously, I use 10w-30 in the spring and fall, when ambient is between about 55 F. and 75 F. Higher than that, and I move to 15w-50. It does seem to maintain better oil pressure once hot, especially toward the end of the change interval....but granted that's subjective.
I think few of us run these cars through the winter anymore, so the "below 32 F." suggestion isn't very critical anymore.

 

Amsoil 20w-50 or Valvoline racing 20w-50. The oil in these cars thins out extremely fast (documented in numerous UOAs, you can also see it by monitoring the oil pressure) because of fuel dilution and turbo abuse. Run a higher viscosity oil and change it at 2000 miles. Running a low viscosity oil might new you a couple of hp, but doesn't not protect the engine as well.

 

I use Mobil 1 10W-30 and 15W-50 have on all my RX-7's since the 80's. Probable moving over to 0W-40. Car not used below about 40-50 deg.

Diff and Trans fluids Redline 75W-90NS and MT90 respective.

 

Manufactures number one goal is fuel economy. thus trend to 0W, racing goal is max Hp thus 0W

 

The 15W-50 Mobil 1 has levels of phos & zinc comparable to yesteryear for protection if you see momentary film breakdown (http://www.mobiloil.com/USA-English/...duct_Guide.pdf)
This doesn't mean much for a DD, but if you track your car, it is a nice safety cushion.

 

switched to 0W-40 today

 

Keep us in formed!

 

I had used Castrol 10W40 on a rebuilt motor, once I reached 1200 miles I switched to Mobil 1 10W40.

OMP disabled as I`m using 8 oz of idemitsu premix per tank.


Andre

 

Penrite HPR-30 which is 20w60. I live in Tropical Cairns, Australia.

 

Still running the 0W-40; this oil has Phos and Zinc levels (1000, 1100 ppm respectively) closer to the olden days