engine oil

markhaigh · 07-31-2007, 02:26 PM

hi

just joined the forum as we have just bought a mazda rx 8 231,i was just wondering if anyone could please recommend to me the best engine oil for the car?

many thanks

mark

onebadapple · 07-31-2007, 04:06 PM

I use Mobil 1 IMO it's the best oil available

rick2 · 08-01-2007, 02:46 AM

Quote:

Originally Posted by onebadapple

I use Mobil 1 IMO it's the best oil available

Let me start this out by saying I rock Mobil1 in my MX-5 all day long, I think its great stuff... for a piston-based engine.

For a rotary, I disagree, since the rotary engine is designed to burn the engine oil as part of its regular operation, and most big-name synthetic oils are designed not to burn. Due to the increased heat in a rotary engine, some brands will burn, but they can leave an ash-like coating on the housings, which can eventually build up and cause problems.

Now, there are some synthetics specifically designed for the rotary (I believe royal purple has a variant), but they are usually very hard to find, and when you do find them, are extremely cost prohibitive.

Before I made the switch to Mobil1 for my MX-5, I usually used Castrol GTX.

In the RX-7 (also a rotary, very similar to the RX-8) we're currently using store-brand cheapo stuff, as we didn't know if the thing would even fire up... soon as its time to top it up, I plan on switching over to the Castrol.

Supersonic · 08-01-2007, 10:22 AM

Mobil 1 probably is the best out there, but not ideal for rotaries.. I too use Castrol GTX. If you check once in a while, you can buy it cheap at walmart

RX8Dude · 08-02-2007, 02:52 PM

Rick is right, use a good minearl based oil and avoid synthetics.

LOL I use Castrol GTX too

Blast Radius · 08-02-2007, 05:16 PM

I use what ever the dealer puts in

markhaigh · 08-03-2007, 08:26 AM

thanks guys,i will get some castroll gtx,the only bad thing i have to say about the rx 8,is that it drinks to much petrol,only getting about 200 miles out of a full tank.

L8APEX · 08-03-2007, 02:02 PM

I have been using Pennzoil 5W-20, with no issue for over 3 years now. Some use 5W-30.

07-31-2007, 02:26 PM	#1 (permalink)
markhaigh Junior Member Join Date: Jul 2007 Posts: 2	engine oil hi just joined the forum as we have just bought a mazda rx 8 231,i was just wondering if anyone could please recommend to me the best engine oil for the car? many thanks mark

08-03-2007, 02:02 PM	#8 (permalink)
L8APEX Senior Member Join Date: Jun 2007 Location: Roswell, Georgia Posts: 374	I have been using Pennzoil 5W-20, with no issue for over 3 years now. Some use 5W-30. __________________ 2004 Titanium Gray Touring 6MT 18x8 Rota Torque - TEIN Flex Coilovers - RacingBrake Slotted Rotors F&R - Mazdatrix Stainless Lines - RacingBeat Sways F&R, REVi Intake and RAM Air Duct - A/C and Oil Cooler Screens - MAZDASPEED Front Strut Brace, Shift Knob - MAZMART Water Pump - Team Moon Custom Catback Exhaust

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07-31-2007, 04:06 PM	#2 (permalink)
onebadapple Member Join Date: Jun 2007 Location: Phoenix Posts: 59	I use Mobil 1 IMO it's the best oil available

08-01-2007, 10:22 AM	#4 (permalink)
Supersonic Senior Member Join Date: May 2007 Location: New York, NY Posts: 345	Mobil 1 probably is the best out there, but not ideal for rotaries.. I too use Castrol GTX. If you check once in a while, you can buy it cheap at walmart

08-02-2007, 02:52 PM	#5 (permalink)
RX8Dude Senior Member Join Date: May 2007 Posts: 214	Rick is right, use a good minearl based oil and avoid synthetics. LOL I use Castrol GTX too

08-02-2007, 05:16 PM	#6 (permalink)
Blast Radius Member Join Date: Jun 2007 Posts: 66	I use what ever the dealer puts in

08-03-2007, 08:26 AM	#7 (permalink)
markhaigh Junior Member Join Date: Jul 2007 Posts: 2	thanks guys,i will get some castroll gtx,the only bad thing i have to say about the rx 8,is that it drinks to much petrol,only getting about 200 miles out of a full tank.