C182 pilot reported an near midair collision with a small jet in oakland center class east airspace.

Attributes
ACN	1621279
Time
Date	201902
Local Time Of Day	1201-1800
Place
Locale Reference	ZOA.ARTCC
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	VFR
Aircraft 2
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 8 Flight Crew Total 160 Flight Crew Type 5
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Vertical 300

Narrative:

Returning at 3;500 cruise altitude heading direct to ccr (concord; ca) between 120 and 130 knots. Using flight following with oakland center (freq 127.8). Executive type; twin engine jet was approaching head on at same flight level. Its landing gear was retracted. Oakland center warned of traffic at 12 o'clock. Approaching jet was on radar; but not identified. Jet did not change course or attitude. Given closing speeds and the fact the jet remained wings level; I determined safest course of evasive action was to force my plane into a steep dive to avoid head on collision. Estimate jet passed directly overhead at approximately 300 feet.

Original NASA ASRS Text

Title: C182 pilot reported an NMAC with a small jet in Oakland Center Class E airspace.

Narrative: Returning at 3;500 cruise altitude heading direct to CCR (Concord; CA) between 120 and 130 knots. Using Flight Following with Oakland Center (Freq 127.8). Executive type; twin engine jet was approaching head on at same flight level. Its landing gear was retracted. Oakland Center warned of traffic at 12 o'clock. Approaching jet was on radar; but not identified. Jet did not change course or attitude. Given closing speeds and the fact the jet remained wings level; I determined safest course of evasive action was to force my plane into a steep dive to avoid head on collision. Estimate jet passed directly overhead at approximately 300 feet.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.