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Technical Q&A
Welcome to PCA's source of expert advice, where our PCA National Technical Committee experts answer your questions about all things technical.
Is 15w-50 oil a safe alternative to 10w-50 Porsche classic oil?
Wednesday 07/23/2025 | 1994 | 968 Cabriolet | Engine
READ ANSWERCrankshaft stuck after timing chain guide replacement
Wednesday 07/23/2025 | 1998 | Boxster | Engine
New to this forum - thanks in advance for any help1998 Boxster I performed the chain guide replacement procedure following Jake R processes and I thought all went well. Finished with bank 1 today and buttoned every
READ ANSWERCenter vent air flow shuts off
Tuesday 07/22/2025 | 2005 | 911 Carrera Cabriolet | Heating and Ventilation
READ ANSWERI'm looking at buying a 2024 718 S. The car has 8943 miles on it but I was told that it has had an Over Rev Report. With the DME report added, should this be a concern and would it void any future warranty claim?
Tuesday 07/22/2025 | 2024 | 718 Boxster S | Engine
The DME report show; 2211_Overspeed range 1: Number of ignitions 79 Z211_Overspeed range 1: operating hours 371.98597 h Z212_Overspeed range 2: Number of ignitions 84 2212 Overspeed range 2: operating hours 371.98603 h 7213 Overspeed range 3: Number of ignitions 76 Z213_Overspeed range 3: operating hours 371.98600 h 7214_ Overspeed range 4: N
READ ANSWERShould I be using a fuel additive?
Sunday 07/20/2025 | 2012 | Cayman R | Fuel System
I use only non ethanol fuel both my 76 911 and my 2012 Cayman. I was told that the non ethanol "clear" fuel has NO additives in it at all. Should I be using any fuel additives and if so what do you recommend?
READ ANSWERLooking to increase torque and hp via a stage 1 tune. Been looking at APR and Cobb. APR seems to provide a bit more of both. Thoughts?
Friday 07/18/2025 | 2019 | 718 Cayman S | Performance Modifications
READ ANSWERWhere do you recommend to buy a more aggressive rear diffuser for a 2019 Cayman S?
Friday 07/18/2025 | 2019 | 718 Cayman S | Body
Looking for a nice rear diffuser to replace stock rear on my 2019 Cayman S. I don't want to buy any cheap one just for looks. Definitely would like a reputable place to purchase.Thank you
READ ANSWERIs there a special Porsche tool to disconnect power steering lines? I've found the link, bought new hoses, but don't see how to disconnect the hose under the car (not the steering rack, and not at the reservoir and pump end) Thanks.
Thursday 07/17/2025 | 2009 | Cayman | Body
Need to disconnect both return line and high pressure lines. Thanks.
READ ANSWERI just watched a video on YouTube on Project Farm about an additive called MotorKote . I have a 2006 Cayenne SI just watched a video on YouTube on project farm about an additive called motor coat. I have a 2006 Cayman. I have no symptoms of bore scoring and would like to keep it that way. Are you familiar with this additive?
Thursday 07/17/2025 | 2006 | Cayman S | Engine
READ ANSWERWhich is recommended for a battery tender or 78 930?
Wednesday 07/16/2025 | 2008 | 911 Turbo | Electrical
Which battery tender do you recommend for a 1978-930
READ ANSWERRecently purchased a 2011 997.2 Carrera S. Has 66,000 miles. Needs new rotors and pads. In looking at FCP euro and Pelican Parts, I, of course see Porsche OEM set, all four rotors, at about $1300. I also see Sebro cross drilled at about $614 a set, SHW at $576 per set, Simmermann at $703 per set, and slotted Sebro set at $737 per set. I prefer slotted, in general. Does anyone have experience in any of these other name brands.
Wednesday 07/16/2025 | 2011 | 911 Carrera S | Brakes
Anyone have experience with using Sebro, SHW or Zimmerman brake rotors as replacement for original Porsche rotors. I understand that these name brands at some point supplied Porsche in the past. That doesn’t mean necessarily that these aftermarket rotors are still at those quality levels. Also. Anyone have experience with Brembro Ceramic brake pads? P65011N and P65014N ? $65 and $64 seems really cheap. Looking for good, maybe better than stock, ceramic pads. Like the lower a ...
READ ANSWER997 Drivers door does open from the inside
Wednesday 07/16/2025 | 2005 | 911 Carrera | Body
The Bowden cable and the door latch mechanism have been replaced; (Parts from Suncoast Porsche) however the driver's door only opens after repeated pulls of the inside door handle. Door will open when I let the window down and use the outside handle. Someone please respond as none of my prior questions have never been answered. Thanks.
READ ANSWERWhere is the best place to get replacement head lights for a 2015 Boxster S?
Tuesday 07/15/2025 | 2015 | Boxster S | Electrical
READ ANSWERDoes anyone have a recommendation for matching door trim to carbon fiber from a brushed aluminum trim? Apparently the door trim is apart of the door panel and they are 3200 each. I want to convert the dash and center console to CF from suncoast but dont want to have mismatch trim on the door. Perhaps carbon fiber tape?
Tuesday 07/15/2025 | 2016 | Cayman GT4 | Interior/Upholstery
READ ANSWERHow to repair scratches on Boxster center windscreen
Tuesday 07/15/2025 | 2005 | Boxster | Other
I tried to repair a scratch on my windscreen now I have a haze in the spot. I'm wondering if there is a coating to be applied Maybe, I've been sanding it off. Any ideas or references? I don't really want to buy a replacement at $300Thanks so muchBernie Blain Delaware PCA
READ ANSWERLooking for PIWIS diagnostic shop to flash 01 Boxster to ROW setting near me. (Springfield, Or)?
Monday 07/14/2025 | 2001 | Boxster | Performance Modifications
Looking for a person/shop to reset my ECU from US Emissions to ROW Rest Of World mode. I live in Springfield, Or. Text/call 541-345-9900. Thank you!
READ ANSWERAnyone have a recommendation for a cell phone mount in a 2016 gt4? I saw one at a car show that clipped onto the center console.
Monday 07/14/2025 | 2016 | Cayman GT4 | Accessories
READ ANSWERLooking for a drivers door wiring harness
Thursday 07/10/2025 | 1997 | Boxster | Electronics
Wiring harness must be for 1997 Boxster only as 1998 and later have extra wire for air bag which a 1997 does not have....any help is greatly
READ ANSWERGetting CEL and Error Codes for P0420 and P0430 - Catalytic System below threshold efficiency Bank 1 and Bank 2
Wednesday 07/09/2025 | 2003 | 911 Targa | Other
Hi good people,Thank you very much for even spending the time to read my message. Just needed to talk to someone else about my thoughts on this matter. I've got a 2003 911 Targa (996.2 in common parlance). Over 100K miles. Recent Check engine light errors are showing up close to when I've done 100 miles (after I've reset the error codes and driven regular, non aggressive miles on freeway etc). P0430 and P0420 Catalytic System Efficiency below threshold banks. Ca ...
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